CODEWITHSUNDEEP
c#wpf
Bülent Alaçam
Bülent Alaçam

Reputation: 197

How can I check textbox is begining only alphabets?

I want to start with alphabet in textbox. How can I check textbox is begining only alphabets ? For example:

Thanks

Upvotes: 0

Views: 386

Answers (3)

RockWorld
RockWorld

Reputation: 1288

1> Create a behaviour as shown here

2> Subscribe to TextChanged event.

3> Apply RegEx (E.g. "^[a-zA-z].*$")

4> clear text if RegEx return false.

<TextBox Text="{Binding ...}" >
  <e:Interaction.Behaviors>
    <b:AlphaTextBehavior/>
 </e:Interaction.Behaviors>
</TextBox>

public class DragBehavior : Behavior<TextBox>
{

    protected override void OnAttached()
    {
      // AssociatedObject.TextChanged += 
    }
}

Upvotes: 0

Mudassir Hasan
Mudassir Hasan

Reputation: 28771

    string input = "N4534 ";

    Regex reg = new Regex("^[a-zA-z].*$"); 

    // Match the input and write results
    Match match = reg.Match(input);

    return match.Success;

Upvotes: 0

Jhonatas Kleinkauff
Jhonatas Kleinkauff

Reputation: 966

try this

string str = "N4535";
bool isLetter = !String.IsNullOrEmpty(str) && Char.IsLetter(str[0]);

Upvotes: 10

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