inserting capital letter in visual basic 2012 (OOP method)

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i'm using Visual Studio 2012 and SQL Server 2012 to make register form.

I'm using keypress to make my textbox only allow letter, when i tried to insert capital letter using caps lock it's not working.

How do I make the coding to allow capital letter?

VB

Private Sub txt_namaayah_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txt_namaayah.KeyPress
       If Not ((e.KeyChar >= "a" And e.KeyChar <= "z") Or e.KeyChar = vbBack) Then e.Handled = True
   End Sub

   Private Sub txt_namaibu_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txt_namaibu.KeyPress
       If Not ((e.KeyChar >= "a" And e.KeyChar <= "z") Or e.KeyChar = vbBack) Then e.Handled = True
   End Sub

   Private Sub txt_namawali_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txt_namawali.KeyPress
       If Not ((e.KeyChar >= "a" And e.KeyChar <= "z") Or e.KeyChar = vbBack) Then e.Handled = True
   End Sub


   Private Sub txt_namasiswa_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txt_namasiswa.KeyPress
       If Not ((e.KeyChar >= "a" And e.KeyChar <= "z") Or e.KeyChar = vbBack) Then e.Handled = True
   End Sub

Posted 15-May-15 21:33pm

asasql

Updated 16-May-15 18:51pm

v2

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King Fisher 16-May-15 3:50am

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1 solution

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OriginalGriff · Accepted Answer · 2015-05-15T22:18:00

At a guess - and without your code that's all it can be - you are testing the key press to see if it is within the range of "a" to "z". Something like this:

C#

private void myTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
    e.Handled = !(e.KeyChar >= 'a' && e.KeyChar <= 'z');
    }

All you need to do is expand that to cope with upper case characters as well:

C#

private void myTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
    e.Handled = !((e.KeyChar >= 'a' && e.KeyChar <= 'z') || (e.KeyChar >= 'A' && e.KeyChar <= 'Z'));
    }

Or just:

C#

private void myTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
    e.Handled = !Char.IsLetter(e.KeyChar);
    }