How to set limit values textbox and show message box when reached maximum limit VB.Net

Question

Sorry for bad english.

I'm beginner in VB.Net, on this question I want to make textbox validation to show messagebox when maximum limit is reached. below this code

Public Class Form1

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
        Dim i As Integer
        TextBox1.MaxLength = 6
        i = TextBox1.MaxLength

        If TextBox1.Text.Length > i Then
            MsgBox("Maximum is 6 Character")
        End If
    End Sub
End Class

If you set the MaxLength property you cannot use this event because your text will never be more that 6 characters. It is the control itself that doesn't accept any input after the 6th character — Steve
– Steve, Commented Dec 14, 2015 at 10:18

Vivek S. · Accepted Answer · 2015-12-14 10:34:06Z

1

In form load event set TextBox1.MaxLength = 6

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
      TextBox1.MaxLength = 6
 End Sub

and use the following code in TextBox1_KeyDown event

 Private Sub TextBox1_KeyDown(ByVal sender As Object _
                             , ByVal e As System.Windows.Forms.KeyEventArgs _
                             ) Handles TextBox1.KeyDown
    If Trim(TextBox1.Text).Length = 6 Then
        MsgBox("Maximum is 6 Character")
    End If
End Sub

Or

Keep TextBox1.MaxLength as system default,if you use below code then no need to alter it's lenghth to 6

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Trim(TextBox1.Text).Length = 6 Then
            e.Handled = True
            MsgBox("Maximum is 6 Character")
        End If
End Sub

edited Dec 14, 2015 at 10:34

answered Dec 14, 2015 at 10:18

Vivek S.

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2 Comments

Sam Makin Over a year ago

Why the Load event? I thought that was anti-pattern. Why not the constructor or the OnLoad event?

A. Maulana Afifi Over a year ago

It's work well, thank you very much for your answer.

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