C# how to put comma for a dicimal in textbox?????

Question

Dear

 

I have a text box which I want to contain only numbers and put comma for decimal (not dot).

 

I just use this code on Event Keypress:

 

if (char.IsNumber(e.KeyChar))

{

}

else

{

e.Handled = e.KeyChar != (char)Keys.Back;

}

 

This code allows only numbers. It does not match my needed.

 

How can I do that to allow only number and comma for decimal?

 

I would appreciate thanks for those solution.

Thank so much.