[Aly El-Haddad]

كود :

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text.ToLower().Contains(TextBox2.Text.ToLower()) Then
            TextBox1.SelectionStart = TextBox1.Text.ToLower().IndexOf(TextBox2.Text.ToLower())
            TextBox1.SelectionLength = TextBox2.Text.Length
            TextBox1.HideSelection = False
        End If
    End Sub
End Class