vba – Calculate and display the amount of a homeowner’s property tax

Having problems with some Visual Basic for school. Can someone look over this code? Also the tax is 1.35% of the property’s assessed value, which will be entered by the user.

Imports System.Windows.Forms.VisualStyles.VisualStyleElement

Public Class Form1
    Private Sub btnStart_Click(sender As Object, e As EventArgs)







    End Sub

    Private Sub Label1_Click(sender As Object, e As EventArgs) Handles Label1.Click

    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click

    End Sub

    Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged

        Private void Button1_Click(Object sender, EventArgs e)
            {
            TextBox2.Text = Convert.ToString((Convert.ToDouble(TextBox1.Text) * 1.35) / 100);
            TextBox2.Show();

            }
        Private void button2_Click(Object sender, EventArgs e)
            {
            this.Close();
            }




    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Double tax = Convert.ToDouble((TextBox1.Text)) * 5 / 100;

           Double Roundedtax = Math.Round(tax, 2);

           TextBox2.Text = Convert.ToString(Roundedtax);

           TextBox2.Show();

           textBox3.Text = Convert.ToString(Convert.ToDouble(TextBox1.Text) + Convert.ToDouble(TextBox2.Text));

           textBox3.Show();



    End Sub
End Class