2. The code..
Public Class frm2
Private Sub VisibleEnabled_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
TextBox.Visible = False
End Sub
Private Sub btn2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn2.Click
TextBox.Visible = True
TextBox.Text = "I am here."
TextBox.Enabled = True
End Sub
Private Sub btn3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn3.Click
TextBox.Visible = True
TextBox.Text = "I am enabled."
TextBox.Enabled = True
End Sub
Private Sub btn4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn4.Click
TextBox.Enabled = False
TextBox.Text = "I am disabled."
End Sub
Private Sub TextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox.TextChanged
End Sub
Private Sub backtoindex_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles backtoindex.Click
Me.Close()
End Sub
End Class
3. Save & Run the program.
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