Counting from a textbox, asp.net

This property to see how long the text is during postback:

TextBox.Text.Length;

      

        
        
        
      

    

TextBox: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.aspx

Text Property: http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.text.aspx

Line length: http://msdn.microsoft.com/en-us/library/system.string.length.aspx

String str = TextBox.Text;

if(str.Length > 50)
{
   str = str.SubString(0, 50) + "<br/>" + str.SubString(50);
}