How to see if the items that are in the text box are integer

Question

Hello all how can i see if the container of the text box is in integer?

Shankar M · Answer

Hi Bitro You can use the int.TryParse method to validate that the string in the Textbox is a valid Integer value. The int.TryParse method converts the given string Input to int. It returns a value false if the Input is not a valid one. Thanks Shankar M

Sandeep Singh Shekhawat · Answer

string Str = textBox1.Text.Trim(); int Num; bool isNum = int .TryParse(Str out Num); if (isNum) MessageBox .Show(Num.ToString()); else MessageBox .Show( Invalid number ); OR bool IsNumber( string text) { Regex regex = new Regex ( @^[-+]?[0-9]*\.?[0-9]+$ ); return regex.IsMatch(text); }

Vulpes · Answer

Try: int i; if (!int.TryParse(textBox1.Text out i)) { MessageBox.Show(Not an integer. Try again); textBox1.Focus(); } else { // do something with 'i' which we now know contains an integer }