How To Allow Only Numbers In TextBox Control?

Posted by Vishalneeraj-24503 on 4/26/2015 | Category: Visual Studio Interview questions | Views: 1746 | Points: 40

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Answer:

We will use Regex.IsMatch method to alow only numbers.
For working with Regex classes,we have to import
System.RegularExpression Namespace.

Using System.RegularExpression.

if (!Regex.IsMatch(txtNumbersOnly.Text,

  @"(^([0-9]*|\d*\d{1}?\d*)$)"))

{

    MessageBox.Show("Not a Number");

}

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