Compare ASCII of Input values to check whether it is Character or Numeric

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VS2008

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I need to check whether user entered a character or numeric digit in DataGridViewTextBoxCell. How to perform this comparison on the basis of ASCII values of entered key in KeyPress Event of DataGridView.
Any Suggestion ?

Posted 19-Sep-12 21:55pm

Itz.Irshad

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AmitGajjar 20-Sep-12 3:57am

ok so what you have done so far ?

Itz.Irshad 20-Sep-12 4:00am

I've tried to achieve the same thing via Regex in CurrentCellDirtyStateChanged Event. It check only first entered character and perform validation accordingly but, when user enters 2nd character or 3rd and so forth.... it didn't work accordingly. I need to check it for every key press in that specif DataGridViewTextBoxCell.

3 solutions

Solution 1

There is an example in the documentation[^].

Posted 19-Sep-12 22:00pm

CPallini

Solution 3

Use one of the System.Char[^] methods to check what it is.

Posted 20-Sep-12 2:35am

Richard MacCutchan

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Isuru Nanayakkara · Accepted Answer · 2012-09-19T22:01:00

I mostly used this code snippet to validate textbox user input. But I think you can use it on a DataGridViewCell as well. Give it a try.

And you don't have to use ASCII codes in C#. You can compare e.KeyChar to an integer which represents the ASCII value directly.

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            //97 - 122 = Ascii codes for simple letters
            //65 - 90  = Ascii codes for capital letters
            //48 - 57  = Ascii codes for numbers

            if (e.KeyChar != 8)
            {
                if (e.KeyChar < 48 | e.KeyChar > 57)
                {
                    e.Handled = true;
                }
            }
        }