I want to know how many time I using "backspace" on VB.NET

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In this richtextbox I want to know how many time using "Backspace" on keyboard. So far I already using this code, but something wrong. this is the scenario, When pressing Enter, message box will show how many time using Backspace. Please help me..

What I have tried:

Public Class Form1
    Private Sub RichTextBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles RichTextBox1.KeyDown
        Dim count As Integer

        If (e.KeyCode = Keys.Back) Then
            count = count + 1
        ElseIf (e.KeyCode = Keys.Enter) Then
            MessageBox.Show(count)
        End If

    End Sub
End Class

Posted 16-Sep-18 7:07am

Member 13986318

Updated 16-Sep-18 8:34am

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OriginalGriff · Answer 1 · 2018-09-16T08:35:00

count is a local variable, it exists only until the method exits and is recreated and reinitialised each time the method is called by a new event.

You need to make it art of your class declaration by moving it outside the method:

VB

Public Class Form1
    Private count As Integer = 0

    Private Sub RichTextBox1_KeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
        If (e.KeyCode = Keys.Back) Then
            count = count + 1
        ElseIf (e.KeyCode = Keys.Enter) Then
            MessageBox.Show(count)
        End If
    End Sub
End Class