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How to convert char array into string for DateTime.Parse? [closed]

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I am using this in my controller:
char[] arrDate = date.ToArray();
DateTime dt = DateTime.Parse(arrDate[0] + arrDate[1] + "/" +
arrDate[2] + arrDate[3] + "/" +
arrDate[4] + arrDate[5] + arrDate[6] + arrDate[7]);
The error:
System.FormatException: String was not recognized as a valid DateTime.

Consider this:
var date = "11252017";
var arrDate = date.ToArray();
var strDate = arrDate[0] + arrDate[1] + "/" +
arrDate[2] + arrDate[3] + "/" +
arrDate[4] + arrDate[5] + arrDate[6] + arrDate[7]; // 98/25/2017
Notice that:
'1' + '1' = 98* ⇒ char + char = int
98 + "/" = "98/" ⇒ int + string = string
"98/" + '2' = "98/2" ⇒ string + char = string
The fix:
var dt = DateTime.Parse("" +
arrDate[0] + arrDate[1] + "/" +
arrDate[2] + arrDate[3] + "/" +
arrDate[4] + arrDate[5] + arrDate[6] + arrDate[7]);
*ASCII representation:
'1' in decimal is 49

I assume date is of type string. For parsing a string the DateTime class has several methods of which ParseExact is one. This method can parse a string given a format specifier and a culture. In your case the date can be parsed like this:
var date = "11252017";
var dt = DateTime.ParseExact(date, "MMddyyyy", CultureInfo.InvariantCulture);
By the way a string is an array of chars, so in your code arrDate[0] is exactly the same as date[0]. Just something to keep in mind for the future.

HTML Agility pack why does not the HTML page get to string? [closed]

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Error "HtmlAgilityPack.HtmlNode.SelectSingleNode(...) return null."
My exemplary code.
string url = #"http://www.baza-firm.com.pl/?vm=zabrze&pg=2&b_szukaj=szukaj";
HtmlWeb web = new HtmlWeb();
//Process.Start(url); //wyswietlenie strony
var doc1 = web.Load(url);
MessageBox.Show(doc1.DocumentNode.OuterHtml.ToString());
var nazwa = doc1.DocumentNode.SelectSingleNode("//span[#class='przeppoz']").InnerText;
var ulica = doc1.DocumentNode.SelectSingleNode("//div[#itemprop='streetAddress']").InnerText;
var kod_pocztowy = doc1.DocumentNode.SelectSingleNode("//div/span[#itemprop='postalCode']").InnerText;
var miejscowość = doc1.DocumentNode.SelectSingleNode("//div/span[#itemprop='addressLocality']").InnerText;
var wojewodztwo = doc1.DocumentNode.SelectSingleNode("//div/span[#itemprop='addressRegion']").InnerText;
var telefon = doc1.DocumentNode.SelectNodes("//div[#class='divSMV_tel1 clearBoth']");
List<string> lista_tel = new List<string>();
foreach (var node in telefon)
{
lista_tel.Add(node.InnerText);
}
MessageBox.Show("nazwa " + nazwa
+ "\nkod pocztowy " + kod_pocztowy
+ "\nulica " + ulica
+ "\nkod pocztowy " + kod_pocztowy
+ "\nmiejscowość " + miejscowość
+ "\nwojewództwo " + wojewodztwo
+ "\ntelefon " + lista_tel[0].ToString());
Previously worked now shows a empty page. Why does not work Agility pack?

Your server returns 404 - Not Found as a response status, but also returns the html content you expect.
So, by changing the downloading code a little bit, your parsing code works...
string url = #"http://www.baza-firm.com.pl/?vm=zabrze&pg=2&b_szukaj=szukaj";
var doc1 = new HtmlAgilityPack.HtmlDocument();
using (var client = new HttpClient())
{
var resp = await client.GetAsync(url);
MessageBox.Show(resp.StatusCode.ToString());
var html = await resp.Content.ReadAsStringAsync();
doc1.LoadHtml(html);
}
MessageBox.Show(doc1.DocumentNode.OuterHtml.ToString());
.....
......

Separating uppercase and lowercase on a string C# [closed]

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can someone please suggest a method wherein i can separate uppercase characters and lowercase characters in a string
input : "heLLoWorLd"
output : "heoordLLWL"

I have prepare one program for you to doing the same:
using System;
using System.Collections.Generic;
using System.IO;
class Program
{
static void Main()
{
// Input string.
string mixedCase = "heLLoWorLd";
// Call ToLower instance method, which returns a new copy.
string lower = "";
string uper = "";
for (int i = 0; i < mixedCase.Length; i++)
{
if (char.IsLower(mixedCase[i]))
lower = lower + mixedCase[i];
else
uper = uper + mixedCase[i];
}
// Display results.
Console.WriteLine("{0}{1}",
lower,
uper);
}
}
OUTPUT:
heoordLLWL
This code will definitely helpful to you.Thank you!

You can make use of few extension methods like the following:
string strInput="heLLoWorLd";
string outputStr =String.Join("",strInput.GroupBy(x=>Char.IsLower(x))
.SelectMany(y=>y.ToList()));
You can try a working example here

Why not just a simple OrderBy? Imo GroupBy and SelectMany is a bit cracking a nut with a sledgehammer
string input = "heLLoWorLd";
string output = string.Concat(input.OrderBy(char.IsUpper)); // heoordLLWL

Try this:
 string input = "heLLoWorLd";
string output = string.Empty;
output = String.Concat(input.Where(c => Char.IsLower(c))) + String.Concat(input.Where(c => Char.IsUpper(c))) ;

Another way,
string str = "WeLcoMe";
string _upper = string.Empty, _lower = string.Empty;
foreach (var s in str)
{
if (char.IsUpper(s))
_upper += s;
else
_lower += s;
}
str = _upper + _lower;
Output will be
WLMecoe

string input = "heLLoWorLd";
StringBuilder builder = new StringBuilder();
StringBuilder upp = new StringBuilder();
StringBuilder low = new StringBuilder();
foreach (char c in input)
{
if (Char.IsLower(c))
{
low.Append(c);
}
else
{
if (Char.IsUpper(c))
{
upp.Append(c);
}
}
}
string output = low.ToString() + upp.ToString();

var input = "heLLoWorLd";
var output = string.Concat(input.GroupBy(char.IsLower).SelectMany(c => c.ToList()));

Need to use a VAR inside an If [closed]

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I have the below code but I know it doesn't work as when I try declaring it, my code says it's not defined but I don't know how to write it.
I no I need to declare is before my IF statement but not sure how. Below is what I have but I know its wrong as I keep saying
if (Session["Step01Tel"] != "")
{
var ContactDetails = Step01TelLabel.Text + " " + Session["Step01Tel"].ToString();
}
else if (Session["Step01Email"] != "")
{
var ContactDetails = Step01EmailLabel.Text + " " + Session["Step01Email"].ToString();
}
Then I'm after something like the below in my code to call it as its for the body of my email that my site sends.
msg.Body = ContactDetails.Tostring()
The reason I'm after this is that if the Tel or Email field is empty then I don't want the Tel/Email label to be displayed in the email and you can not us an If inside an email body.
The below shows how I initially had it but as I said this displayed the field label with no value.
////NEED TO ONLY DISPLAY IF VALUE IS PRESENT
// Step01TelLabel.Text + " " + Session["Step01Tel"].ToString()
// + Environment.NewLine.ToString() +
// Step01EmailLabel.Text + " " + Session["Step01Email"].ToString()
// + Environment.NewLine.ToString() +
////

Try this
var ContactDetails = string.Empty;
if (Session["Step01Tel"] != "")
{
ContactDetails = Step01TelLabel.Text + " " + Session["Step01Tel"].ToString();
}
else if (Session["Step01Email"] != "")
{
ContactDetails = Step01EmailLabel.Text + " " + Session["Step01Email"].ToString();
}

Read File by Splitting Each Row in C# [closed]

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I am trying to read the File by Splitting each Row by removing whitespace through regex.split in c# but my code isn't working properly need help. Thanks in Advance.
text="";
OpenFileDialog open = new OpenFileDialog();
if (open.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Stream filestream = open.OpenFile();
if (filestream != null)
{
string filename = open.FileName;
text = File.ReadAllText(filename);
}
string code = textBox1.Text;
columncounter = code.Length;
string[] arrays = Regex.Split(code, #"\s+");
textBox1.Text = text;
}

If you are trying to write each row, without whitespace, to your TextBox, this should work:
var result = new StringBuilder();
foreach (var line in File.ReadAllLines(filename))
{
result.AppendLine(Regex.Replace(line, #"\s", "")));
}
textBox1.Text = result.ToString();
For faster performance, use string.Replace:
var result = new StringBuilder();
foreach (var line in File.ReadAllLines(filename))
{
result.AppendLine(line
.Replace("\t", "")
.Replace("\n", "")
.Replace("\r", "")
.Replace(" ", ""));
}
textBox1.Text = result.ToString();

Just add textBox1.text = string.Concat(arrays). It will concatenate the strings from the splitted array.
or you could do something like text.Replace(" ", "")