Reading integer values from a textbox in visual C# 2008

Question

Hi I'm a newbie in visual C# and i need to read values from a textbox into an integer variable. The user is not allowed to input other characters but numbers into the textbox. int a1; string ia1; ia1 = txtMNA1.Text.ToString(); a1 = Convert.ToInt32(ia1); This is what i wrote and it returns Input string was not in a correct format. runtime error. Thanks for your help Hristo

Mahesh Chand · Answer

Where did you put this code? This code should run only after the value is entered. If value is an integer it will work otherwise you will get an error. If you are trying to just find out if input value is an Int and if not then throw an error then you need to use Int.Parse method and pass the value. Put Int32.Parse method within a try..catch statement and if try fails show an error message within catch statement empty the TextBox and set focus on the TextBox.