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Jun 2nd, 2008

Textbox Validation

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Hi i want to prevent the user from entering number and special charaters in a textbox and another textbox from entering alphabets and specials characters .....

Need it quickly coz 2moro have to submit my project...

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geetajlo

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Junior Poster in Training

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72 posts
since Sep 2007

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Jun 2nd, 2008

Re: Textbox Validation

This following code just allowed you to entered numbers only (No alphabetics or any special characters) :

vb.net Syntax (Toggle Plain Text)
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
    If (Microsoft.VisualBasic.Asc(e.KeyChar) < 48) _
              Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 57) Then
            e.Handled = True
    End If
    If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
    End If
End Sub
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
    If (Microsoft.VisualBasic.Asc(e.KeyChar) < 48) _
              Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 57) Then
            e.Handled = True
    End If
    If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
    End If
End Sub

This following code just allowed you to entered strings / alphabetics only (no numbers or any special characters):

vb.net Syntax (Toggle Plain Text)
Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
        If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
            Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) _
            And (Microsoft.VisualBasic.Asc(e.KeyChar) < 97) _
            Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 122) Then
            'Allowed space
            If (Microsoft.VisualBasic.Asc(e.KeyChar) <> 32) Then
                e.Handled = True
            End If
        End If
        ' Allowed backspace
        If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
        End If
End Sub
Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
        If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
            Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) _
            And (Microsoft.VisualBasic.Asc(e.KeyChar) < 97) _
            Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 122) Then
            'Allowed space
            If (Microsoft.VisualBasic.Asc(e.KeyChar) <> 32) Then
                e.Handled = True
            End If
        End If
        ' Allowed backspace
        If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
        End If
End Sub

Last edited by Jx_Man; Jun 2nd, 2008 at 8:33 am.

Jx_Man

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Solved Threads: 392

Posting Sensei

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3,138 posts
since Nov 2007

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Jun 3rd, 2008

Re: Textbox Validation

To make text box to accept only numbers, in key press event of that textbox u can code like this

If Char.IsDigit(e.KeyChar) = False And Char.IsControl(e.KeyChar) = False Then
e.Handled = True
MsgBox("Please enter valid number ")
End If

i think u can mannage other one..

Last edited by Pgmer; Jun 3rd, 2008 at 3:24 am.

Pgmer

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Practically a Master Poster

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668 posts
since Apr 2008

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Mar 2nd, 2009

Re: Textbox Validation

Click to Expand / Collapse Quote originally posted by geetajlo ...

Hi i want to prevent the user from entering number and special charaters in a textbox and another textbox from entering alphabets and specials characters .....

Need it quickly coz 2moro have to submit my project...

--------
Use the following code..
#Region "TextBox Events"

Private Sub txtFinRefNo_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtFinRefNo.KeyPress
Try
If Char.IsLetterOrDigit(e.KeyChar) = False And Char.IsControl(e.KeyChar) = False Then
e.Handled = True
End If
Catch ex As Exception
ShowException(ex.Message, MESSAGEBOX_TITLE, ex)
End Try
End Sub
#End Region

sabeer pasha.

sabeerpasha

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Newbie Poster

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3 posts
since Sep 2008

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