How to limit input

[ad]

I want to limit the input of usr to 0..9 or a..z
How can I do that?

 

[Peter Duniho]

I want to limit the input of usr to 0..9 or a..z
How can I do that?

There are lots of ways. One would be to use a MaskedTextBox control.

Pete

 

[Duggi]

Hi
If you are using winforms Masked Textbox would be appropriate choice.

Drag drop masked text box on to window form and set the mask property
to custom mask and put mask as AAAAAAAAAAAAAAAAAAA.

only pain point is you need to know the number of chars.

Hope this solves the issue at hand.

Thanks
-Srinivas.

 

[ad]

Thanks,
How can I use regex expression?

Hi
If you are using winforms Masked Textbox would be appropriate choice.

Drag drop masked text box on to window form and set the mask property
to custom mask and put mask as AAAAAAAAAAAAAAAAAAA.

only pain point is you need to know the number of chars.

Hope this solves the issue at hand.

Thanks
-Srinivas.

 

[Rad [Visual C# MVP]]

Thanks,
How can I use regex expression?

Hey ad,

Here's a small program to do what you want

First, put this in the class imports

using System.Text.RegularExpressions;

Then run this


public static void Main()
{
//
// Get the input
//
string inputString="aA";
Console.WriteLine(IsValid(inputString));
Console.ReadLine();
}

//
// This function validates the input
//
static bool IsValid(string s){
//
// Create a regex
//
Regex r = new Regex(@"^[0-9a-z]*$");
//
// Check if the input matches
//
return r.IsMatch(s);
}