how to insert character between the string

Hi,

I am using windows application. for eg i have a label having following string:-

http://reena.india.yahoo.com and in any text box if i put sport then immediately 
text should become (even on keypress) http://sport.reena.india.yahoo.com or 
http://www.sport.reena.india.yahoo.com. even space should replace with _ (underscore).

How it should done. i need to use only keypress. keyup or keydown event 
not leave event. I want as user enter the value it should show him immidiately, 
because i am using windows application. i only want the example of windows application, since previous answer in 
not working for me

thanks in advance

the KeyPress event as stated earlier would be invoked on every key press and would create a nuisance
and not solve your problem?

The easiest way is to use String.Replace. On the underscore, do a Replace again after concatenation.

Like, 
string finalString = originalstring.Replace("http://", "http://www.").Replace(" " , "_");

You should perhaps do this on TextBox Lost Focus Or perhaps the Leave Event

private void textBox1_Leave(object sender, EventArgs e)
{
	string originalString = textBox1.Text.Trim();
	if (!string.IsNullOrEmpty(originalString )
	{
		textBox1.Text  = originalstring.Replace("http://", "http://www.").Replace(" " , "_");
	}
}

Hope that helps.