As some of you know , in C# , there is no method like "IsNumeric()" . That's why , this method below helps you to prevent entering letters in the textbox or something like that.Hope to use this code in your applications.I used this code in my sms application sending from USB modem

string myval= textBox1.Text;
int Num;
bool isNum = int.TryParse(myval.ToString(), out Num);
if (isNum)
{

}
else
{
textBox1.Text = "";
}

if you have any question about code , u are able to reach me.

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