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Resources » Articles » .NET Framework »
How to validate textboxes in a simple way
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Take two text boxes txt1 and txt2 and two buttons
add code to keypress event of txtboxes
Private Sub txt1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txt1.KeyPress
If (Char.IsControl(e.KeyChar) = False) Then
If (Char.IsLetter(e.KeyChar)) Or (Char.IsWhiteSpace(e.KeyChar)) Then
'do nothing
Else
e.Handled = True
MsgBox("Sorry Only Character & Spaces Allowed!!", MsgBoxStyle.Information, "Verify")
txt1.Focus()
End If
End If
End Sub
Private Sub txt2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txt2.KeyPress
If (Char.IsControl(e.KeyChar) = False) Then
If (Char.IsDigit(e.KeyChar)) Then
'do nothing
Else
e.Handled = True
MsgBox("Sorry Only Digits Allowed!!", MsgBoxStyle.Information, "Verify")
txt2.Focus()
End If
End If
End Sub
Also to ensure user must enter something and not blank spaces
put this code
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
If (txt1.Text.Trim = "") Then
MsgBox("Blank not Allowed", MsgBoxStyle.Information, "Verify")
Else
MsgBox(txt1.Text, MsgBoxStyle.Information, "Verify")
End If
txt1.Clear()
txt1.Focus()
End Sub
Private Sub btn2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn2.Click
If (txt2.Text.Trim = "") Then
MsgBox("Blank not Allowedt", MsgBoxStyle.Information, "Verify")
Else
MsgBox(txt2.Text, MsgBoxStyle.Information, "Verify")
End If
txt2.Clear()
txt2.Focus()
End Sub
End Class
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