How to allow spaces while making custom control?

Question

1.00/5 (1 vote)

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SQL-Server-2005

.NET3.5

, +

hello!!
In my school fees structure project i need text boxes either contain string or int value so for that purpose i make my custom controls for numeric & for characters it is working properly but it is not taking space between two string...
my code

C#

public class Class1 : TextBox
    {
        protected override void OnKeyPress(KeyPressEventArgs e)
        {


            if (char.IsNumber(e.KeyChar) == false)
            {
                if ((e.KeyChar == (char)Keys.Back)||(e.KeyChar==(char)Keys.Space))
                {
                    e.Handled = false;

                }
                else
                    e.Handled = true;
            }
        }
    }


    public class TextBoxAlphabetic : TextBox
    {
        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            if (char.IsLetter(e.KeyChar) == false)
            {
                if ((e.KeyChar == (char)Keys.Back)||(e.KeyChar==(char)Keys.Space))
                    e.Handled = false;
                else
                    e.Handled = true;
            }
        }
    }

should i use && oprator???

Posted 21-Mar-13 5:45am

Arifa S

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OriginalGriff · Accepted Answer · 2013-03-21T06:27:00

"should i use && oprator??? "
No.
You can't replace the "||" with and "&&" - otherwise teh test will always fail as teh KeyChar value cannot both be Key.Back and Key.Space at the same time - for the same reason it can't be 'X' and '7' at the same time!

Put a breakpoint at the start of each handler, and follow it through - see what happens when you press the space bar and try to work it out from there.

BTW: Don't write it like this:

C#

if (char.IsNumber(e.KeyChar) == false)

INstead, use this:

C#

if (!char.IsNumber(e.KeyChar))

It's a lot more compact and more obvious once you get used to it!