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Trackbar Percent to richtextbox Text

i have a Trackbar and want it to add the Current Value to a richtextbox Text without replacing the whole Text Line
richTextBox1.Rtf = richTextBox1.Rtf.Replace("aimbot_aimtime=85.000000", "aimbot_aimtime=" + trackbarpercent.Text + ".000000");
(i get the Value from my Label)
Thats what im using right now but it only Replaces it if the Text is "aimbot_aimtime=85.000000"
i want it to add the new Value after "aimbot_aimtime=NEWVALUE" but i cant get it to work atm

#Marc Lyon
I think a better way for me is to Replace the Line itself cause its always Line 7
Got it working, thanks to all who helped :)
void changeLine(RichTextBox RTB, int line, string text)
{
int s1 = RTB.GetFirstCharIndexFromLine(line);
int s2 = line < RTB.Lines.Count() - 1 ?
RTB.GetFirstCharIndexFromLine(line + 1) - 1 :
RTB.Text.Length;
RTB.Select(s1, s2 - s1);
RTB.SelectedText = text;
}
private void trackbarpercent_Click(object sender, EventArgs e)
{
changeLine(richTextBox1, 7, "aimbot_aimtime=" + aimtimetrackbar.Value + ".000000");
}

You have to know what the value is in order to replace it, which is why it only works when the value is your default value of 85.
In order to replace the text with the new text, you will have to track the previous value somewhere to use in your replacement. This means a field in your form, a property in some class. Let's say you create an int field on your form (myForm) called oldAimbot_aimtime. Every time the slider changes, put old value into this field. now your code becomes:
var prompt = "aimbot_aimtime=";
var oldvalue = string.Format("{0}{1}", prompt, myForm.oldAimbot_aimtime);
var newvalue = string.Format("{0}{1}", prompt, {NEWVALUE}.Format("#.######");
richTextBox1.Rtf = richTextBox1.Rtf.Replace(oldvalue, newvalue);
This code is off the top of my head and may not work exact, but it should replace the value. What is the value of using a richtextbox on a config screen? Can you post a screenshot?
OK, I see the screenshot. Ethics aside (not sure there is such a thing as a legit aimbot). You are using the richtextbox presumably because it was the easiest control for you to style...
Where you use the richtextbox is probably better suited to a GridView, ListBox, maybe even a treeview where you have finer control over each element.
If you want to use the richtext, write code which emits each option, then you can obtain exact values to use in rtf.Replace()commands
Hope this helps.

To enter in decimal format in textbox

Below code which I am using right now does not give what I require.
textBox1.Text = textBox1.Text + enteredvalue;
I would like to achieve entering decimal value in text box without having to enter ".".
If 3 is entered, the output in text box should be 00.03, and then if 5 is entered the output should be 00.35 and so on.
How do I achieve it?
EDIT: I achieved it by creating a method and calling it everytime i press the input number.
public void dropcashvalue(string inputdigit)
{
if (txtDropCash.Text == "00.00")
{
txtDropCash.Text = "";
this.dropstring = "";
}
this.dropstring = this.dropstring + inputdigit;
txtDropCash.Text = (Convert.ToDouble(this.dropstring) / 100).ToString("F2");
}
My textbox and inputnumber design looks like this.

You need to maintain an additional variable for your compund value.
double enteredValue = 0.0;
Whenever a new digit comes in you add it to your value:
enteredValue = enterValue*10 + inputDigit;
Inthe Textbox you show a formatted version of your value:
textBox.Text = (enteredValue/100).ToString("F2");

C# string problems

I have a multiline text box called txtOutput that receives messages from the serial port. Each new message is a new line and represents a number from 1 to a maximum of 4 digits.
The method used to add the data in the multiline textbox is an append.
I have no problems with the above feature, it is working fine.
I would like to take the last message from the txtOutput and show it in textBox2 if the number is less than 1000, and in textbox3 if it is not. Then both text boxes would be updated.
I would appreciate if someone can give in an example especially in how to get the last message from the multiline textbox to a variable and how to update the textboxes if there is a new value.

You should save the last message (from the serial port) in a variable such as lastSerialMesssage. You can then convert this value to an integer and use a conditional statement to check if the value is smaller than 1000, if it is, set TextBox3 to the last serial message value, else set the value to TextBox2.
string lastSerialMessage = SerialPortMessage;
int lastMessageValue;
Int32.TryParse(lastSerialMessage, out lastMessageValue);
if (lastMessageValue < 1000)
{
TextBox3.Text = lastSerialMessage;
} else {
TextBox2.Text = lastSerialmessage;
}
http://msdn.microsoft.com/en-us/library/f02979c7.aspx

Thanks to all for the suggestions but as I mentioned in my comments, the suggested methods did not work because the content of the string was not accurate and I ended up receiving in the textBox 2 and 3 only part of the data and not always. I have solved the problem (thanks to other advices) using RegEx in this way:
if (txtOutput.Text.Length > 0)
{
MatchCollection mc = Regex.Matches(txtOutput.Text, #"(\+|-)?\d+");
if (mc.Count > 0)
{
long value = long.Parse(mc[mc.Count - 1].Value);
if (value < 1000)
{
textBox2.Text = value.ToString();
}
else
{
value = value - 1000;
textBox3.Text = value.ToString();
}
}
}
this is working fine and no piece of information are lost.Thanks again for your advices.

Search specified string inside textbox

i have textbox with text:
1234 YYMM 1057316895 12, AB 6386 ABC
where YYMM is in this case Year and Month. What i'd like to do is to search if in this textbox exist YYMM, and highlight this part of text, or somehow show that in this specified textbox exist not fully completed field.
So when i rewrite this string with 1203 instead of YYMM error will not be received.
And! This YYMM can be in any place of string in textbox, so i can't do something like
if (textbox1.Text.Substring(x,4)=="YYMM) {}
where x is index of YYMM location.
Tnx

Here a sample pseudocode that can help you; (Put in your validating event)
int pos = textbox1.Text.IndexOf("YYMM");
if(pos != -1)
{
textbox1.SelectionStart = pos;
textbox1.SelectionLength = 4;
// MessageBox("Error");
}

This will assign the start index and the length of the selection, but it will not make it visible. To ensure visibility, I would recommend to add
textbox1.ScrollToCaret();
textbox1.HideSelection = false;

Error on int.parse

Input string was not in a correct format. At this line:
int total = 0;
total = int.Parse(TextBox2.Text) + int.Parse(TextBox4.Text) + int.Parse(TextBox6.Text) +
int.Parse(TextBox8.Text) + int.Parse(TextBox10.Text) + int.Parse(TextBox12.Text) +
int.Parse(TextBox14.Text) + int.Parse(TextBox16.Text);
Label1.Text = total.ToString();
I would like to pass the value to another page.
what does it means? T_T
Thanks in advance :)
protected void Button1_Click(object sender, EventArgs e)
{
Session["Month"] = DropDownList2.SelectedValue;
Session["expen1"] = TextBox1.Text;
Session["expen2"] = TextBox3.Text;
Session["expen3"] = TextBox5.Text;
Session["expen4"] = TextBox7.Text;
Session["expen5"] = TextBox9.Text;
Session["expen6"] = TextBox11.Text;
Session["expen7"] = TextBox13.Text;
Session["expen8"] = TextBox15.Text;
int totalvalue = 0;
totalvalue = int.Parse(TextBox2.Text) + int.Parse(TextBox4.Text) + int.Parse(TextBox6.Text) + int.Parse(TextBox8.Text) + int.Parse(TextBox10.Text) + int.Parse(TextBox12.Text) + int.Parse(TextBox14.Text) + int.Parse(TextBox16.Text);
Label1.Text = totalvalue.ToString();
Session["price1"] = TextBox2.Text;
Session["price2"] = TextBox4.Text;
Session["price3"] = TextBox6.Text;
Session["price4"] = TextBox8.Text;
Session["price5"] = TextBox10.Text;
Session["price6"] = TextBox12.Text;
Session["price7"] = TextBox14.Text;
Session["price8"] = TextBox16.Text;
Session["total"] = Label1.Text;
Server.Transfer("sum.aspx");
}
I want to store the result in sum.aspx.

If any of your TextBox values are null or are not a number, this will break. In order for this to work, all of the TextBox values will need to have a default value of 0 and you will have to restrict the input of the TextBox to numbers.

Instead of using textboxes and parsing text you trust to be numeric, use some sort of input mask or validation BEFORE parsing. Alternatively, use a different control like a Numeric up/down or numeric spinner.
You need to learn about how to handle exceptions, when to use try parse and when to use parse...

If any of the textboxes is empty, you will get an exception, since empty text cannot be parsed.
Use int.TryParse instead.

what does it means?
One of your TextBoxes contains a text which can't be parsed as an Integer.

Check Each textbox data should be numbers. if try enter string and validating with int.parse you will get this error.

It means that one of the textboxes values (TextBox#.Text) contains a value that cannot be "converted" to an integer.
What values are inside the textboxes? For example, if the textbox contains a non-numeric character it wont be able to convert, since the letter 'a' has no numeric value.

It means that one of the calls to int.Parse threw an exception because the text value was not a value that could be parsed into an Integer (e.g. the text was a non numeric value).
A better way to do this would be:
var textBoxesToParse = new [] { TextBox2, TextBox4, TextBox6, TextBox8, TextBox10, TextBox12, TextBox14, TextBox16 };
int total = 0;
foreach (var textBox in textBoxesToParse)
{
int textBoxValue;
if(int.TryParse(textBox.Text, out textBoxValue))
{
total += textBoxValue;
}
else
{
// The textbox had an invalid value, up to you what you need to do here.
}
}

As has been mentioned, the error is that one of your textboxes has either a blank or a non-numeric value.
You can use a RegularExpressionValidator so that the user is permitted to submit the form only when the values are numeric.
<asp:RegularExpressionValidator ID="RegularExpressionValidator7" runat="server"
ControlToValidate="txtLastName"Display="Dynamic" ErrorMessage="Numeric characters only"
ForeColor="Red" ValidationExpression="^[0-9]*$"
Additionally, you should also look to use tryParse or Int32.Parse(); the latter returns 0 if it is passed a null string.