i am developing a simple marks grading system using vb.net in visual studio 2013. my code is this.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click If TextBox1.Text >= 0 And TextBox1.Text = 51 And TextBox1.Text = 0 And TextBox2.Text = 51 And TextBox2.Text = 0 And TextBox3.Text = 51 And TextBox3.Text