Category: WPF

07 Sep 2015 02:31

Joined:	07/05/2007
Level:	Gold
Points:	573

Points:	3

Textbox only allow characters from a-z

hi

i want to make a textbox in wpf C# which accepts characters from a-z.now i used the code as
private void txt_name_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (char.IsLetter((char)e.Key)) e.Handled = true;

}
but the textbox not allowing v,w,x,y,z pls help me with a right code

#762163

07 Sep 2015 02:52

Joined:	29/05/2009
Level:	Gold
Points:	10380

Points:	4

Hi

Can You try this Code for WPF Concept

Design Side


<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="889" Left="10">
    <Grid>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="19,114,0,0" 
        TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="840" Name="TxtName" 
        KeyDown="TxtName_KeyDown" />
    </Grid>
</Window>

I have mention Below Code for WPF Windows Application Code -> C# Language Code


private void TxtName_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key >= Key.A && e.Key <= Key.Z)
            {
            }
            else
            {
                e.Handled = true;
            }
        }

In this code we canot enter the numeric value only A-Z value only allow check them.

I have attached Snapshot also check this

Name : Dotnet Developer-2015
Email Id : kumaraspcode2009@gmail.com

'Not by might nor by power, but by my Spirit,' says the LORD Almighty.

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#762164

07 Sep 2015 03:02

Joined:	29/05/2009
Level:	Gold
Points:	10380

Points:	2

Hi

Can you try this code


private void TxtName_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (!Char.IsLetter((char)KeyInterop.VirtualKeyFromKey(e.Key)) & e.Key != Key.Back | e.Key == Key.Space)
            {
                e.Handled = true;
                MessageBox.Show("Only A-Z only");
            }
        }

Name : Dotnet Developer-2015
Email Id : kumaraspcode2009@gmail.com

'Not by might nor by power, but by my Spirit,' says the LORD Almighty.

#762166

07 Sep 2015 03:17

Joined:	07/05/2007
Level:	Gold
Points:	573

Points:	1

thank you for your reply
dear Dotnet Developer-2015, your code is working but when i press tab key in the keyboard for going to next textbox, showing the messagebox("Only A-Z only");
pls help

#762167

07 Sep 2015 03:22

Joined:	29/05/2009
Level:	Gold
Points:	10380

Points:	0

Hi
Aparna

If My Code Fixed in Your Issue means

Select as best answer . which is have in my Response below.

Name : Dotnet Developer-2015
Email Id : kumaraspcode2009@gmail.com

'Not by might nor by power, but by my Spirit,' says the LORD Almighty.

#762168

07 Sep 2015 03:29

Joined:	29/05/2009
Level:	Gold
Points:	10380

Points:	3

Hi
Apar

You can follow this code for when the press tab key focusing next control working Good for me.

Design Side


<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="889" Left="10">
    <Grid>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="254,51,0,0" 
        TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="112" Name="TxtName" 
        KeyDown="TxtName_KeyDown" PreviewKeyDown="TxtName_PreviewKeyDown" />
        <Label Content="Label" HorizontalAlignment="Left" Margin="171,51,0,0" VerticalAlignment="Top"/>
        <TextBox HorizontalAlignment="Left" Height="23" Margin="254,132,0,0" 
        	TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="112" x:Name="TxtName_Copy" 
        	KeyDown="TxtName_KeyDown" PreviewKeyDown="TxtName_PreviewKeyDown" />
        <Label Content="Label" HorizontalAlignment="Left" Margin="171,132,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.553,3.731"/>
    </Grid>
</Window>

I have mention Below Code for WPF Windows Application Code -> C# Language Code



  private void TxtName_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (!Char.IsLetter((char)KeyInterop.VirtualKeyFromKey(e.Key)) & e.Key != Key.Back | e.Key == Key.Space)
            {
                if (e.Key != Key.Tab)
                {
                    e.Handled = true;
                    MessageBox.Show("Only A-Z only");
                }
            }
        }

Dont forgot if My answer helpful to you select as best answer thats helpful to others then grow our website in software world.

Name : Dotnet Developer-2015
Email Id : kumaraspcode2009@gmail.com

'Not by might nor by power, but by my Spirit,' says the LORD Almighty.

#762170

07 Sep 2015 04:53

Joined:	06/04/2012
Level:	Gold
Points:	4230

Points:	4

Hello Aparna,

Refer the below code :

XAML Code :

<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300" Loaded="Window_Loaded">
<Grid>
<TextBox Name="TextBox1" Height="25" Width="auto" BorderBrush="Black" PreviewTextInput="TextBox1_PreviewTextInput"></TextBox>
<Button Name="Button1" Content="Support Button" Height="25" Width="100" Grid.Column="0" FlowDirection="LeftToRight" HorizontalAlignment="Right"></Button>
</Grid>
</Window>

C# Code :

using System.Text.RegularExpressions;

private static bool IsTextAllowed(string text)
{
Regex regex = new Regex("^[a-zA-Z]+$"); //regex that matches disallowed text
return regex.IsMatch(text);
}

private void TextBox1_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
e.Handled = !IsTextAllowed(e.Text);
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
TextBox1.Focus();
}

See the attached image. It's an output i have get by using above code.

Hope this the exact solution you are looking for.

Regards,
Nirav Lalan
DNS Gold Member
"If you can dream it, you can do it."

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#762171

07 Sep 2015 20:44

Joined:	12/02/2013
Level:	Gold
Points:	3098

Points:	4

Hi

To allow only capitals A to Z use below code


private void txt_name_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.keychar>='A' && e.keychar<='Z')
e.Handled=false;
else
e.Handled=true;
}

To allow only small letters from a to z use below code


private void txt_name_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.keychar>='a' && e.keychar<='z')
e.Handled=false;
else
e.Handled=true;
}

If you want textbox to allow A to Z and a to z use below code


private void txt_name_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.keychar>='A' && e.keychar<='Z' || e.keychar>='a' && e.keychar<='z')
e.Handled=false;
else
e.Handled=true;
}

Regards

Sridhar Thota.

Sridhar Thota.
Editor: DNS Forum.

#762179

07 Sep 2015 22:38

Joined:	06/04/2012
Level:	Gold
Points:	4230

Points:	2

Hello Kumar,

Let me correct you. You have mentioned "Server Side C# Code".

As per my knowledge in WPF Windows Application Code - behind doesn't call as server side code if i am not wrong.

Hope you don't mind.

Regards,
Nirav Lalan
DNS Gold Member
"If you can dream it, you can do it."

#762180

07 Sep 2015 23:13

Joined:	29/05/2009
Level:	Gold
Points:	10380

Points:	2

OK NIRAV SIR

I HAVE UPDATED THIS

I have mention Below Code for WPF Windows Application Code -> C# Language Code

Name : Dotnet Developer-2015
Email Id : kumaraspcode2009@gmail.com

'Not by might nor by power, but by my Spirit,' says the LORD Almighty.

Textbox only allow characters from a-z

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