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I have an issue with converting numbers to words

so i'm having an issue with the decimal part where the number that you input in the console is for example 0,02 and it gives in words only 2 out of the 3 characters (skips the second 0) i tried many solutions including just doing an if() where i have a double mn = 0.9 but i found out that the if works only to 0 it accepts the variable that i made but its seems like it doesnt understands it. If you have any idea how i can fix this glad to hear
P.S I've attached the whole code on the other paragraph. Thank you!
what i want to happen Input 0,02 ---> output zero point zero two
what is happening Input - 0,02 ----> output zero point 2
static void Main(string[] args)
{
Console.OutputEncoding = System.Text.Encoding.Unicode;
// OT VIKTOR BOTKOV 304sr
try
{
Console.WriteLine("Въведете число.....:");
string number = Console.ReadLine();
number = ConvertAmount(double.Parse(number));
Console.WriteLine("Числото изписано в думи е : \n{0}", number);
Console.ReadKey();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
private static String[] units = { "нула", "едно", "две", "три",
"четири", "пет", "шест", "седем", "осем", "девет", "десет", "единайсет",
"дванайсет", "тринайсет", "четиринайсет", "петнайсет", "шеснайсет",
"седемнайсет", "осемнайсет", "деветнайсет" };
private static String[] tens = { "", "", "двайсет", "трийсет", "четиресет",
"педесет", "шейсет", "седемдесет", "осемдесет", "деведесет" };
private static String[] hundreds = {"","сто", "двеста", "триста","четиристотин",
"петстотин", "шестстотин", "седемстотин", "осемстотин", "деветстотин" };
private static String[] thousands = {"","хиляда","две хиялди", "три хиляди","четири хиляди",
"пет хиляди", "шест хиляди", "седем хиляди", "осем хиляди", "девет хиляди" };
private static String[] unitsс = { "нула ", "един", "два", };
public static String ConvertAmount(double amount)
{
try
{
double mn = 0.09;
Int64 amount_int = (Int64)amount;
Int64 amount_dec = (Int64)Math.Round((Decimal)(amount - (double)(amount_int)) * 100);
if (amount_dec == 0)
{
return Convert(amount_int) + " лв.";
}
else if (amount_int <= mn)
{
return Convert(amount_int) + " Цяло и " + " Нула " + Convert(amount_dec) + " ст.";
}
else
{
return Convert(amount_int) + " лв. и " + Convert(amount_dec) + " ст.";
}
}
catch (Exception e)
{
}
return "";
}
public static String Convert(Int64 i)
{
Console.OutputEncoding = System.Text.Encoding.Unicode;
if (i<=2)
{
return unitsс[i];
}
if (i < 20)
{
return units[i];
}
if (i < 100)
{
return tens[i / 10] + ((i % 10 > 0) ? " и " + Convert(i % 10) : "");
}
if (i < 1000)
{
return hundreds[i / 100] + ((i % 100 > 0) ? " и " + Convert(i % 100) : "");
}
if (i < 100000)
{
return Convert(i / 1000) + " Хиляди "
+ ((i % 1000 > 0) ? " " + Convert(i % 1000) : "");
}
else if (i < 1000000)
{
return Convert(i / 10000) + " Хиляди "
+ ((i % 10000 > 0) ? " и " + Convert(i % 10000) : "");
}
if (i < 10000000)
{
return Convert(i / 1000000) + " Милиона "
+ ((i % 1000000 > 0) ? " " + Convert(i % 1000000) : "");
}
if (i < 100000000)
{
return Convert(i / 1000000) + " Милиона "
+ ((i % 1000000 > 0) ? " и " + Convert(i % 1000000) : "");
}
if (i < 1000000000)
{
return Convert(i / 1000000) + " Милиона "
+ ((i % 1000000 > 0) ? " " + Convert(i % 1000000) : "");
}
if (i < 10000000000)
{
return Convert(i / 1000000000) + " Милиaрда "
+ ((i % 1000000000 > 0) ? " " + Convert(i % 1000000000) : "");
}
return Convert(i / 1000000000000) + " "
+ ((i % 1000000000000 > 0) ? " " + Convert(i % 10000000000000) : "");
}
}

Error casting string to Decimal

I am getting these two errors :
the type string cannot convert to decimal
at:
(str1 = (Decimal) (num1 / num3).ToString("0.00").Replace(".00", string.Empty);)
and
(str2 = (Decimal) (num4 / num5).ToString("0.00").Replace(".00", string.Empty);)
How do I fix this?
private void TotalMB_Click(object sender, EventArgs e)
{
uint num1 = (uint) (this.K10Ks.Value + this.S12Ks.Value + this.DSRKs.Value + this.PeaceKs.Value + this.M1216Ks.Value + this.SCARKs.Value + this.CQBKs.Value + this.ANKs.Value + this.R870Ks.Value + this.BallistaKs.Value + this.KSGKs.Value + this.M27Ks.Value + this.TypeKs.Value + this.MP7Ks.Value + this.PDWKs.Value + this.MTARKs.Value + this.MSMCKs.Value + this.EVOKs.Value + this.TacKs.Value + this.SMRKs.Value + this.FivesKs.Value + this.KAPKs.Value + this.B23RKs.Value + this.SWATKs.Value + this.MK48Ks.Value + this.XPRKs.Value + this.M8A1Ks.Value + this.LSATKs.Value + this.ExeKs.Value + this.HAMRKs.Value + this.FALKs.Value + this.QBBKs.Value + this.SVUKs.Value + this.BowKs.Value + this.BallKnifeKs.Value + this.SMAWKs.Value + this.RPGKs.Value + this.ShieldKs.Value + this.FHJKs.Value + this.K9Oth.Value + this.StikOth.Value + this.HtOth.Value + this.SwrOth.Value + this.LodsOth.Value + this.CPacOth.Value + this.VTOLOth.Value + this.MisOth.Value + this.SenyOth.Value + this.ChopOth.Value + this.GdiOth.Value + this.DrnOth.Value + this.WathOth.Value + this.DrgOth.Value + this.RXOth.Value + this.WarOth.Value + this.AGROth.Value + this.DetOth.Value);
uint num2 = (uint) (this.K10Hd.Value + this.S12Hd.Value + this.DSRHd.Value + this.PeaceHd.Value + this.M1216Hd.Value + this.SCARHd.Value + this.CQBHd.Value + this.ANHd.Value + this.R870Hd.Value + this.BallistaHd.Value + this.KSGHd.Value + this.M27Hd.Value + this.TypeHd.Value + this.MP7Hd.Value + this.PDWHd.Value + this.MTARHd.Value + this.MSMCHd.Value + this.EVOHd.Value + this.TacHd.Value + this.SMRHd.Value + this.FivesHd.Value + this.KAPHd.Value + this.B23RHd.Value + this.SWATHd.Value + this.MK48Hd.Value + this.XPRHd.Value + this.M8A1Hd.Value + this.LSATHd.Value + this.ExeHd.Value + this.HAMRHd.Value + this.FALHd.Value + this.QBBHd.Value + this.SVUHd.Value + this.BallKnifeHd.Value);
uint num3 = (uint) (this.K10De.Value + this.S12De.Value + this.DSRDe.Value + this.PeaceDe.Value + this.M1216De.Value + this.SCARDe.Value + this.CQBDe.Value + this.ANDe.Value + this.R870De.Value + this.BallistaDe.Value + this.KSGDe.Value + this.M27De.Value + this.TypeDe.Value + this.MP7De.Value + this.PDWDe.Value + this.MTARDe.Value + this.MSMCDe.Value + this.EVODe.Value + this.TacDe.Value + this.SMRDe.Value + this.FivesDe.Value + this.KAPDe.Value + this.B23RDe.Value + this.SWATDe.Value + this.MK48De.Value + this.XPRDe.Value + this.M8A1De.Value + this.LSATDe.Value + this.ExeDe.Value + this.HAMRDe.Value + this.FALDe.Value + this.QBBDe.Value + this.SVUDe.Value + this.BowDe.Value + this.BallKnifeDe.Value + this.ShieldDe.Value);
uint num4 = (uint) (this.TDMWin.Value + this.FreeForAllWin.Value + this.SDWin.Value + this.DominationWin.Value + this.HardpointWin.Value + this.HeadquartersWin.Value + this.DemolitionWin.Value + this.CTFWin.Value + this.KillConfirmedWin.Value + this.GunGameWin.Value + this.OneintheChamberWin.Value + this.SharpshooterWin.Value + this.SticksandStonesWin.Value + this.HCTDMWin.Value + this.HCSDWin.Value + this.HCDominationWin.Value + this.HCKillConfirmedWin.Value);
uint num5 = (uint) (this.TDMLos.Value + this.FreeForAllLos.Value + this.SDLos.Value + this.DominationLos.Value + this.HardpointLos.Value + this.HeadquartersLos.Value + this.DemolitionLos.Value + this.CTFLos.Value + this.KillConfirmedLos.Value + this.GunGameLos.Value + this.OneintheChamberLos.Value + this.SharpshooterLos.Value + this.SticksandStonesLos.Value + this.HCTDMLos.Value + this.HCSDLos.Value + this.HCDominationLos.Value + this.HCKillConfirmedLos.Value);
string str1;
double num6;
if ((int) num1 != 0 && (int) num3 != 0)
{
str1 = (Decimal) (num1 / num3).ToString("0.00").Replace(".00", string.Empty);
}
else
{
num6 = 0.0;
str1 = num6.ToString();
}
string str2;
if ((int) num4 != 0 && (int) num5 != 0)
{
str2 = (Decimal) (num4 / num5).ToString("0.00").Replace(".00", string.Empty);
}
else
{
num6 = 0.0;
str2 = num6.ToString();
}
int num7 = (int) MessageBox.Show("Kills: " + (object) num1 + "\nDeaths: " + (object) num3 + "\nWins: " + (object) num4 + "\nLosses: " + (object) num5 + "\nHeadshots: " + (object) num2 + "\nK/D: " + str1 + "\nW/L: " + str2 + "\n\nDon't Include Medals");
}

Just remove the casts to Decimal and it works like expected:
private void TotalMB_Click(object sender, EventArgs e)
{
uint num1 = (uint) (this.K10Ks.Value + this.S12Ks.Value + this.DSRKs.Value + this.PeaceKs.Value + this.M1216Ks.Value + this.SCARKs.Value + this.CQBKs.Value + this.ANKs.Value + this.R870Ks.Value + this.BallistaKs.Value + this.KSGKs.Value + this.M27Ks.Value + this.TypeKs.Value + this.MP7Ks.Value + this.PDWKs.Value + this.MTARKs.Value + this.MSMCKs.Value + this.EVOKs.Value + this.TacKs.Value + this.SMRKs.Value + this.FivesKs.Value + this.KAPKs.Value + this.B23RKs.Value + this.SWATKs.Value + this.MK48Ks.Value + this.XPRKs.Value + this.M8A1Ks.Value + this.LSATKs.Value + this.ExeKs.Value + this.HAMRKs.Value + this.FALKs.Value + this.QBBKs.Value + this.SVUKs.Value + this.BowKs.Value + this.BallKnifeKs.Value + this.SMAWKs.Value + this.RPGKs.Value + this.ShieldKs.Value + this.FHJKs.Value + this.K9Oth.Value + this.StikOth.Value + this.HtOth.Value + this.SwrOth.Value + this.LodsOth.Value + this.CPacOth.Value + this.VTOLOth.Value + this.MisOth.Value + this.SenyOth.Value + this.ChopOth.Value + this.GdiOth.Value + this.DrnOth.Value + this.WathOth.Value + this.DrgOth.Value + this.RXOth.Value + this.WarOth.Value + this.AGROth.Value + this.DetOth.Value);
uint num2 = (uint) (this.K10Hd.Value + this.S12Hd.Value + this.DSRHd.Value + this.PeaceHd.Value + this.M1216Hd.Value + this.SCARHd.Value + this.CQBHd.Value + this.ANHd.Value + this.R870Hd.Value + this.BallistaHd.Value + this.KSGHd.Value + this.M27Hd.Value + this.TypeHd.Value + this.MP7Hd.Value + this.PDWHd.Value + this.MTARHd.Value + this.MSMCHd.Value + this.EVOHd.Value + this.TacHd.Value + this.SMRHd.Value + this.FivesHd.Value + this.KAPHd.Value + this.B23RHd.Value + this.SWATHd.Value + this.MK48Hd.Value + this.XPRHd.Value + this.M8A1Hd.Value + this.LSATHd.Value + this.ExeHd.Value + this.HAMRHd.Value + this.FALHd.Value + this.QBBHd.Value + this.SVUHd.Value + this.BallKnifeHd.Value);
uint num3 = (uint) (this.K10De.Value + this.S12De.Value + this.DSRDe.Value + this.PeaceDe.Value + this.M1216De.Value + this.SCARDe.Value + this.CQBDe.Value + this.ANDe.Value + this.R870De.Value + this.BallistaDe.Value + this.KSGDe.Value + this.M27De.Value + this.TypeDe.Value + this.MP7De.Value + this.PDWDe.Value + this.MTARDe.Value + this.MSMCDe.Value + this.EVODe.Value + this.TacDe.Value + this.SMRDe.Value + this.FivesDe.Value + this.KAPDe.Value + this.B23RDe.Value + this.SWATDe.Value + this.MK48De.Value + this.XPRDe.Value + this.M8A1De.Value + this.LSATDe.Value + this.ExeDe.Value + this.HAMRDe.Value + this.FALDe.Value + this.QBBDe.Value + this.SVUDe.Value + this.BowDe.Value + this.BallKnifeDe.Value + this.ShieldDe.Value);
uint num4 = (uint) (this.TDMWin.Value + this.FreeForAllWin.Value + this.SDWin.Value + this.DominationWin.Value + this.HardpointWin.Value + this.HeadquartersWin.Value + this.DemolitionWin.Value + this.CTFWin.Value + this.KillConfirmedWin.Value + this.GunGameWin.Value + this.OneintheChamberWin.Value + this.SharpshooterWin.Value + this.SticksandStonesWin.Value + this.HCTDMWin.Value + this.HCSDWin.Value + this.HCDominationWin.Value + this.HCKillConfirmedWin.Value);
uint num5 = (uint) (this.TDMLos.Value + this.FreeForAllLos.Value + this.SDLos.Value + this.DominationLos.Value + this.HardpointLos.Value + this.HeadquartersLos.Value + this.DemolitionLos.Value + this.CTFLos.Value + this.KillConfirmedLos.Value + this.GunGameLos.Value + this.OneintheChamberLos.Value + this.SharpshooterLos.Value + this.SticksandStonesLos.Value + this.HCTDMLos.Value + this.HCSDLos.Value + this.HCDominationLos.Value + this.HCKillConfirmedLos.Value);
string str1;
double num6;
if ((int) num1 != 0 && (int) num3 != 0)
{
// Cast removed here
str1 = (num1 / num3).ToString("0.00").Replace(".00", string.Empty);
}
else
{
num6 = 0.0;
str1 = num6.ToString();
}
string str2;
if ((int) num4 != 0 && (int) num5 != 0)
{
// Cast removed here
str2 = (num4 / num5).ToString("0.00").Replace(".00", string.Empty);
}
else
{
num6 = 0.0;
str2 = num6.ToString();
}
int num7 = (int) MessageBox.Show("Kills: " + (object) num1 + "\nDeaths: " + (object) num3 + "\nWins: " + (object) num4 + "\nLosses: " + (object) num5 + "\nHeadshots: " + (object) num2 + "\nK/D: " + str1 + "\nW/L: " + str2 + "\n\nDon't Include Medals");
}

You are converting to String and then cast it to a string actually.
Like this you would cast first:
((Decimal) (num1 / num3)).ToString()

Finding Closest Edge to a Point in a PictureBox

I need to find 2 closest edges to a point within a picturebox.I'm using the following method
void findclosestedges(Point p)
{
//Xedge=1 -- Left Edge is closer to Point 2--Right Edge
int Xedge,Yedge;
//Finding closest Left/Right Edge
if (p.X < (Width - p.X))
{
Xedge = 1;
LaunchOrigin2.closestedge.Text = " ";
LaunchOrigin2.closestedge.Text = LaunchOrigin2.closestedge.Text + " left";
}
else
{
Xedge = 2;
LaunchOrigin2.closestedge.Text = " ";
LaunchOrigin2.closestedge.Text = LaunchOrigin2.closestedge.Text + " right";
}
//Finding closest Top/Bottom Edge
if (p.Y < (Height - p.Y))
{
Yedge = 1;
LaunchOrigin2.closestedge.Text = LaunchOrigin2.closestedge.Text + " top";
}
else
{
Yedge = 2;
LaunchOrigin2.closestedge.Text = LaunchOrigin2.closestedge.Text + " bottom";
}
}
Is my approach correct? Are there any caveats for this approach?
Please advice.

As mentioned in the comments this might not be the correct place since your code is working, at least as far as i know?
But a few comments might be that i am not sure why you set the text to a value and then on the next row add to it?
LaunchOrigin2.closestedge.Text = " ";
LaunchOrigin2.closestedge.Text = LaunchOrigin2.closestedge.Text + " left";
Why not just do it directly:
LaunchOrigin2.closestedge.Text = " " + " left";
Or of course the correct way:
LaunchOrigin2.closestedge.Text = " left";
I would also shorten down the code like the following:
void findclosestedges(Point p) {
int Xedge = p.X < (Width - p.X) ? 1 : 2;
int Yedge = p.Y < (Height - p.Y) ? 1 : 2;
LaunchOrigin2.closestedge.Text = (Xedge == 1 ? " left" : " right") + (Yedge == 1 ? " top" : " bottom");
}
But that is just my two cents...

How to Continue The Text from one textblock to another textblock if the first textblock text length is limited?

I am creating a bank cheques so in that i have 6 textblocks first 2 is for date and name on the cheque 3rd,4th,5th is for amount in words and 6th is for amount in figures so endusers of my organization will provide date,name and amount in figures and amount in figures will be relected and converted in amount in words upto here it is fine but my requirement is in the 3rd overflowing and i would like to continue the text in 4th textblock.
public ICICICHEQUE()
{
InitializeComponent();
if (!this.IsVisible)
{
this.Show();
}
this.WindowState = WindowState.Normal;
this.WindowState = WindowState.Minimized;
this.Activate();
this.Topmost = true;
this.Focus();
this.ShowInTaskbar = true;
if (txtblckAmountInFigures.Text != null)
{
ConvertTxtBlockInDecimal();
}
}
private void ConvertTxtBlockInDecimal()
{
txtblckAmountInWords.Text = UtilityMethods.ConvertToWords(Convert.ToDecimal(txtblckAmountInFigures.Text), "isCheque") + "only/-"+"\r\n";
}

you need to split your code and use these two methods
public static string DecimalToText(string decimalPart)
{
string[] digits = {"Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
string result = "";
foreach(char c in decimalPart)
{
int i = (int)c - 48;
if (i < 0 || i > 9) return ""; // invalid number, don't return anything
result += " " + digits[i];
}
return result;
}
public static string NumberToText(int number, bool useAnd, bool useArab)
{
if (number == 0) return "Zero";
string and = useAnd ? "and " : ""; // deals with using 'and' separator
if (number == -2147483648) return "Minus Two Hundred " + and + "Fourteen Crore Seventy Four Lakh Eighty Three Thousand Six Hundred " + and +"Forty Eight";
int[] num = new int[4];
int first = 0;
int u, h, t;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
if (number < 0)
{
sb.Append("Minus ");
number = -number;
}
string[] words0 = {"" ,"One ", "Two ", "Three ", "Four ", "Five " ,"Six ", "Seven ", "Eight ", "Nine "};
string[] words1 = {"Ten ", "Eleven ", "Twelve ", "Thirteen ", "Fourteen ", "Fifteen ", "Sixteen ", "Seventeen ", "Eighteen ", "Nineteen "};
string[] words2 = {"Twenty ", "Thirty ", "Forty ", "Fifty ", "Sixty ", "Seventy ","Eighty ", "Ninety "};
string[] words3 = { "Thousand ", "Lakh ", "Crore " };
num[0] = number % 1000; // units
num[1] = number / 1000;
num[2] = number / 100000;
num[1] = num[1] - 100 * num[2]; // thousands
num[3] = number / 10000000; // crores
num[2] = num[2] - 100 * num[3]; // lakhs
for (int i = 3; i > 0; i--)
{
if (num[i] != 0)
{
first = i;
break;
}
}
for (int i = first; i >= 0; i--)
{
if (num[i] == 0) continue;
u = num[i] % 10; // ones
t = num[i] / 10;
h = num[i] / 100; // hundreds
t = t - 10 * h; // tens
if (h > 0) sb.Append(words0[h] + "Hundred ");
if (u > 0 || t > 0)
{
if (h > 0 || i < first) sb.Append(and);
if (t == 0)
sb.Append(words0[u]);
else if (t == 1)
sb.Append(words1[u]);
else
sb.Append(words2[t - 2] + words0[u]);
}
if (i != 0) sb.Append(words3[i - 1]);
}
string temp = sb.ToString().TrimEnd();
if (useArab && Math.Abs(number) >= 1000000000)
{
int index = temp.IndexOf("Hundred Crore");
if (index > -1) return temp.Substring(0, index) + "Arab" + temp.Substring(index + 13);
index = temp.IndexOf("Hundred");
return temp.Substring(0, index) + "Arab" + temp.Substring(index + 7);
}
return temp;
}
}

Use substring to split the text and display in 2 textboxes.
var requiredText = UtilityMethods.ConvertToWords(Convert.ToDecimal(txtblckAmountInFigures.Text), "isCheque") + "only/-"+"\r\n";
if(requiredText.Count > 255)
{
textbox1.Text = requiredText.subString(0,255);
textbox2.Text = requiredText.subString(255,requiredText.Count-1);
}
else
{
textbox1.Text = requiredText;
}

"Object cannnot be cast from DBNull to other types"

I am working on an asp.net project, it takes values from the front end, stores them as string in a matrix. When the matrix size is greater than 5 * 5, it keep returns an InvalidCastException (It works fine on 5 * 5 matrix and under).
The code is attached below, with a screen shot of Exception:
public partial class WebForm1 : System.Web.UI.Page
{
public DataSet relmatrix = new DataSet();
public DataTable rt = new DataTable();
public Double[] inconsistency;
public int nodersnum;
public string strrel;
protected void Button1_Click(object sender, EventArgs e)
{
nodersnum = Convert.ToInt16(count.Text);
switch (nodersnum)
{
case 1:
break;
case 2:
{ strrel = RelationAB2.Text; }
break;
case 3:
{ strrel = RelationAB3.Text + " " + RelationAC3.Text + " " + RelationBC3.Text; }
break;
case 4:
{ strrel = RelationAB4.Text + " " + RelationAC4.Text + " " + RelationAD4.Text + " " + RelationBC4.Text + " " + RelationBD4.Text + " " + RelationCD4.Text; }
break;
case 5:
{ strrel = RelationAB5.Text + " " + RelationAC5.Text + " " + RelationAD5.Text + " " + RelationAE5.Text + " " + RelationBC5.Text + " " + RelationBD5.Text + " " + RelationBE5.Text + " " + RelationCD5.Text + " " + RelationCE5.Text + " " + RelationDE5.Text; }
break;
case 6:
{ strrel = RelationAB6.Text + " " + RelationAC6.Text + " " + RelationAD6.Text + " " + RelationAE6.Text + " " + RelationAF6.Text + " " + RelationBC6.Text + " " + RelationBD6.Text + " " + RelationBE6.Text + " " + RelationBF6.Text + " " + RelationCD6.Text + " " + RelationCE6.Text + " " + RelationCF6.Text + " " + RelationDE6.Text + " " + RelationDF6.Text + " " + RelationEF6.Text; }
break;
case 7:
{ strrel = RelationAB7.Text + " " + RelationAC7.Text + " " + RelationAD7.Text + " " + RelationAE7.Text + " " + RelationAF7.Text + " " + RelationAG7.Text + " " + RelationBC7.Text + " " + RelationBD7.Text + " " + RelationBE7.Text + " " + RelationBF7.Text + " " + RelationBG7.Text + " " + RelationCD7.Text + " " + RelationCE7.Text + " " + RelationCF7.Text + " " + RelationCG7.Text + " " + RelationDE7.Text + " " + RelationDF7.Text + " " + RelationDG7.Text + " " + RelationEF7.Text + " " + RelationEG7.Text + " " + RelationFG7.Text; }
break;
default:
{ strrel = ""; }
break;
}
GenerateTable.generatetable(relmatrix, strrel, rt, nodersnum);
Class1.generatePC(nodersnum, relmatrix);
int num = 0;
double maxincon = 0.0;
int mi = 0, mj = 0, mk = 0;
inconsistency = new Double[43] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
for (int i = 0; i < nodersnum - 2; i++)
{
for (int k = i + 1; k < nodersnum - 1; k++)
{
for (int j = k + 1; j < nodersnum; j++)
{
if ((Convert.ToString(relmatrix.Tables["relTable"].Rows[i][j]) != " ") && (Convert.ToString(relmatrix.Tables["relTable"].Rows[i][k]) != " ") && (Convert.ToString(relmatrix.Tables["relTable"].Rows[k][j]) != " "))
{
Double a = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][j]);//obtain value from the matrix
Double b = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][k]);//obtain value from the matrix
//PROBLEM
Double c = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[k][j]);//obtain value from the matrix
inconsistency[num] = (Class1.Min(System.Math.Abs(1 - a / (b * c)), System.Math.Abs(1 - (b * c) / a)));//calculate the inconsistency value and store in the inconsistency array
//Get the biggest inconsistency number
if (inconsistency[num] >= maxincon)
{
maxincon = inconsistency[num];
mi = i;
mj = j;
mk = k;
}
num++;
}
}
}
}
Class1.sort(inconsistency);//sort inconsistency array
while (inconsistency[0] > 0.3333333)
{
for (int i = 0; i < nodersnum - 2; i++)
{
for (int k = i + 1; k < nodersnum - 1; k++)
{
for (int j = k + 1; j < nodersnum; j++)
{
if ((Convert.ToString(relmatrix.Tables["relTable"].Rows[i][j]) != " ") && (Convert.ToString(relmatrix.Tables["relTable"].Rows[i][k]) != " ") && (Convert.ToString(relmatrix.Tables["relTable"].Rows[k][j]) != " "))
{
Double a = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][j]);//obtain value from the matrix
Double b = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][k]);//obtain value from the matrix
// PROBLEM
Double c = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[k][j]);//obtain value from the matrix
if (inconsistency[0] == (Class1.Min(System.Math.Abs(1 - a / (b * c)), System.Math.Abs(1 - (b * c) / a))))//calculate the inconsistency value and store in the inconsistency array
{
if ((b * c) < a)
{
double A = (b * c) / ((a + b + c) * (a + b + c));
double B = (a + 2 * b * c) / (a + b + c);
double C = b * c - a;
double m = B * B - 4 * A * C;
if (m < 0)
{
Console.Write("error");
break;
}
else
{
double x1 = (-1 * B + System.Math.Sqrt(m)) / (2 * A);
double x2 = (-1 * B - Math.Sqrt(m)) / (2 * A);
if ((x1 > 0) && (x2 < 0))
{
b = (float)(b + (b * x1) / (a + b + c));
c = (float)(c + (c * x1) / (a + b + c));
a = (float)(a - (a * x1) / (a + b + c));
}
else if ((x1 < 0) && (x2 > 0))
{
b = (float)(b + (b * x2) / (a + b + c));
c = (float)(c + (c * x2) / (a + b + c));
a = (float)(a - (a * x2) / (a + b + c));
}
else if ((x1 > 0) && (x2 > 0))
{
double x = Class1.Min((float)x1, (float)x2);
b = (float)(b + (b * x) / (a + b + c));
c = (float)(c + (c * x) / (a + b + c));
a = (float)(a - (a * x) / (a + b + c));
}
else if ((x1 < 0) && (x2 < 0))
{
break;
}
}
}
else if ((b * c) > a)
{
double A = (b * c) / ((a + b + c) * (a + b + c));
double B = -1 * (a + 2 * b * c) / (a + b + c);
double C = b * c - a;
double m = B * B - 4 * A * C;
if (m < 0)
{
Console.Write("error");
break;
}
else
{
double x1 = (-1 * B + Math.Sqrt(m)) / (2 * A);
double x2 = (-1 * B - Math.Sqrt(m)) / (2 * A);
if ((x1 > 0) && (x2 < 0))
{
b = (float)(b - (b * x1) / (a + b + c));
c = (float)(c - (c * x1) / (a + b + c));
a = (float)(a + (a * x1) / (a + b + c));
}
else if ((x1 < 0) && (x2 > 0))
{
b = (float)(b - (b * x2) / (a + b + c));
c = (float)(c - (c * x2) / (a + b + c));
a = (float)(a + (a * x2) / (a + b + c));
}
else if ((x1 > 0) && (x2 > 0))
{
double x = Class1.Min((float)x1, (float)x2);
b = (float)(b - (b * x) / (a + b + c));
c = (float)(c - (c * x) / (a + b + c));
a = (float)(a + (a * x) / (a + b + c));
}
else if ((x1 < 0) && (x2 < 0))
{
break;
}
}
}
}
relmatrix.Tables["relTable"].Rows[i][j] = Convert.ToString(a);
relmatrix.Tables["relTable"].Rows[i][k] = Convert.ToString(b);
relmatrix.Tables["relTable"].Rows[k][j] = Convert.ToString(c);
}
}
}
}
num = 0;
maxincon = 0.0;
mi = 0;
mj = 0;
mk = 0;
for (int i = 0; i < nodersnum - 2; i++)
{
for (int k = i + 1; k < nodersnum - 1; k++)
{
for (int j = k + 1; j < nodersnum; j++)
{
if ((Convert.ToString(relmatrix.Tables["relTable"].Rows[i][j]) != " ") && (Convert.ToString(relmatrix.Tables["relTable"].Rows[i][k]) != " ") && (Convert.ToString(relmatrix.Tables["relTable"].Rows[k][j]) != " "))
{
Double a = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][j]);//obtain value from the matrix
Double b = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][k]);//obtain value from the matrix
Double c = Convert.ToDouble(relmatrix.Tables["relTable"].Rows[k][j]);//obtain value from the matrix
inconsistency[num] = (Class1.Min(System.Math.Abs(1 - a / (b * c)), System.Math.Abs(1 - (b * c) / a)));//calculate the inconsistency value and store in the inconsistency array
// Get the biggest inconsistency number
if (inconsistency[num] >= maxincon)
{
maxincon = inconsistency[num];
mi = i;
mj = j;
mk = k;
}
num++;
}
}
}
}
//sort inconsistency array
Class1.sort(inconsistency);
}
//Fill up the whole pairwise comparsion matrix, when row=col, the value =1, when row<col the vaule[col][row] is "1/"[col][row]
//nodersnum is how many nodes, row is the matrix row, col is column of matrix
for (int row = 0; row < nodersnum; row++)
{
for (int col = row; col < nodersnum; col++)
{
if (row < col)
{
//set the the value of lower matrix
relmatrix.Tables["relTable"].Rows[col][row] = "1/" + relmatrix.Tables["relTable"].Rows[row][col];
}
//set the value of diagnoal
else if (row == col)
{
relmatrix.Tables["relTable"].Rows[row][col] = "1";
}
}
}
//compute the weight of each element
Double[] rowproduct;
rowproduct = new Double[7] { 1, 1, 1, 1, 1, 1, 1 };
for (int i = 0; i < nodersnum; i++)
{
for (int j = 0; j < nodersnum; j++)
{
if (i >= j)
{
rowproduct[i] = rowproduct[i] / Convert.ToDouble(relmatrix.Tables["relTable"].Rows[j][i]);
}
else
{
rowproduct[i] = rowproduct[i] * Convert.ToDouble(relmatrix.Tables["relTable"].Rows[i][j]);
}
}
}
Double[] num1;
num1 = new Double[7] { 0, 0, 0, 0, 0, 0, 0 };
double numsum = 0;
//compute each row total number(power of node number)
for (int i = 0; i < nodersnum; i++)
{
num1[i] = Math.Pow(rowproduct[i], 1 / (double)nodersnum);
numsum = numsum + num1[i];
}
//transfer into the number of percentage
Double[] weight;
weight = new Double[7] { 0, 0, 0, 0, 0, 0, 0 };
for (int i = 0; i < nodersnum; i++)
{
weight[i] = (int)Math.Round(100 * num1[i] / numsum * 100) / 100f;
Console.WriteLine(weight[i]);
}
GridView2.DataSource = relmatrix;
GridView2.DataBind();
this.GridView2.Rows[mi].Cells[mj].BackColor = System.Drawing.Color.Red;
this.GridView2.Rows[mi].Cells[mk].BackColor = System.Drawing.Color.Red;
this.GridView2.Rows[mk].Cells[mj].BackColor = System.Drawing.Color.Red;
Label3.Text = "Maximum Inconsistency after Reduction: " + Convert.ToString(inconsistency[0]);
TextBox1.Text = Convert.ToString(weight[0]);
TextBox2.Text = Convert.ToString(weight[1]);
TextBox3.Text = Convert.ToString(weight[2]);
TextBox4.Text = Convert.ToString(weight[3]);
TextBox5.Text = Convert.ToString(weight[4]);
TextBox6.Text = Convert.ToString(weight[5]);
TextBox7.Text = Convert.ToString(weight[6]);
}
}

Looks like your matrix contains null values. You cannot cast them into Double.
Check like this:
if (relmatrix.Tables["relTable"].Rows[i][k] != DBNull.Value)
Or
if (relmatrix.Tables["relTable"].Rows[i][k] != null)

Use nullable double as shown below:
var mynull = DBNull.Value;
Double? c = Convert.IsDBNull(mynull) ? (double?)null : Convert.ToDouble(mynull);
In your case:
Double? c = Convert.IsDBNull(relmatrix.tables["relTable"].Rows[k][j]) ? (double?)null : Convert.ToDouble(relmatrix.tables["relTable"].Rows[k][j]);;
Alternatively using if-else:
if(Convert.IsDBNull(relmatrix.tables["relTable"].Rows[k][j]) == true)
{
Double? c = (double?)null;
}
else
{
Double? c = Convert.ToDouble(relmatrix.tables["relTable"].Rows[k][j]);
}