how to remove row in string function

I've run the sample with no errors. What's your error message?
Please note that for using Lines, the MultiLine Property of TextBox must be True.

sir, am using webform .
 error accured in lines.
 String txtText = "";
 int index = 0;
 foreach (String x in txtAddress.Lines)
{ if (index++ < 7)
 txtText += x + Environment.NewLine;
 }

How to remove remain rows in multiline textbox controls


protected void cbOLX_CheckedChanged(object sender, EventArgs e)
{
 string allstr = txtAddress.Text;
 Regex rx = new Regex("\\x20+");
 rx = new Regex("(\r\n)+");
string str1 = allstr.Replace("Price per m2:", "").Trim();
str1 = rx.Replace(str1, "\r\n");
string str2 = str1.Replace("Furnished:", "").Trim();
 str2 = rx.Replace(str2, "\r\n");
 string str3 = str2.Replace("Rooms:", "").Trim();
 str3 = rx.Replace(str3, "\r\n");
string str4 = str3.Replace("Square meters:", "").Trim();
str4 = rx.Replace(str4, "\r\n");
 txtAddress.Text = str4.Replace(" ", "");
 String txtText  = "";
 txtAddress.Lines.Take(7).ToList().ForEach(x => txtText += x + Environment.NewLine);
 }

If we suppose to use it in the Load event of a WinForm, we could write a thing like that:

private void Form1_Load(object sender, EventArgs e)
{
   String txtText = "";
   textBox1.Lines.Take(7).ToList().ForEach(x => txtText += x + Environment.NewLine);

   MessageBox.Show(txtText);
}


Unpacking the LINQ query to "normal" code, is as if we're writing this:

String txtText = "";
int index = 0;
foreach (String x in textBox1.Lines)
{
    if (index++ < 7) txtText += x + Environment.NewLine;
}

You could do it using LINQ in C#. If your TextBox is named "textBox1", you could easily create a String variable containing the first 7 lines of TextBox by doing:


textBox1.Lines.Take(7).ToList().ForEach(x => txtText += x + Environment.NewLine); 


After that, txtText variable will contain the first 7 lines of text.
Hope this helps.