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

Jan Montano · Answer

That's odd. Please post more code. Thanks.

Aleksandar Hristovski · Answer

i executed the same code on another computer and it worked it was a computer specific error after all sorry for your trouble and thanks for your help.

Aleksandar Hristovski · Answer

This is really confusing i input 1 into the textbox the code gets executed and the messagebox says it's not an integer. so i set a message box to display the string variable ia1 and it returns void so somehow the contents of the textbox never get copied into the string variable. i double checked everything and i can't find a problem so i guess it's a computer specific bug if you have other suggestions please let me know.

Jan Montano · Answer

int a1; string ia1; ia1 = textBox1.Text; int result; if (Int32.TryParse(ia1 out result)) { a1 = Convert.ToInt32(ia1); MessageBox.Show(string.Format(Input {0} is an integer ia1)); } else { MessageBox.Show(string.Format(Input {0} is not an integer ia1)); }

Aleksandar Hristovski · Answer

The textbox can only contain integer values so i have tried it only with numbers and yet somehow it doesn't work. I'm thinking of taking the ascii value of the string subtract 48 out of it and setting the integer to be the result. However i can't get the ascii of a string is there function for it? Thanks Hristo

Scott Lysle · Answer

If the value in the textbox is a int what you have would work. It would not work for example if the value contained in the textbox were not an int but rather something like a decimal value.

Manish Dwivedi · Answer

Hi Code u have written is working in my end for integer values. because u are converting string value to integer so u have to take care about the input values. That error will come if u provide the values like that 123c12.00 and these values can't be converted into int because now these are string values. So put the validation in the textbox for accepting the integer values.