Create Unit Test for function in C# in ASP.Net

How to create a unit testing for a function

        protected void Finish_Click(object sender, EventArgs e)
        {
            bool status = yes_wk.Checked;
            int score = 0;
            if (Page.IsValid)
            {
                if (q5.SelectedItem.Value == "4")
                {
                    score += 1;
                }
            }

            // score = (score / 10) * 100;

            score = score * 9;

            lblScore1.Text = "The score is   " + score.ToString() + " % of corrected answers";

            if (score >= 70)
            {
                sqlConfigConnString1 = ConfigurationManager.ConnectionStrings["Citistaff"].ConnectionString;

                DBaseConnection appConnect = new DBaseConnection(sqlConfigConnString1);
                appConnect.Conn.ConnectionString = appConnect.ConnectionString;


                sqlStatement1 = "INSERT INTO MathTestScore (MathTestScore, SignDateTime, Status, Emailsession)";
                sqlStatement1 += "VALUES(@MathTestScore, @SignDateTime, @Status, @Emailsession)";

                if (appConnect.Conn.State == ConnectionState.Closed)
                {
                    appConnect.OpenConnection();
                    appConnect.ExecuteQuery(sqlStatement1);
                }

                appConnect.Comd.Parameters.AddWithValue("@MathTestScore", lblScore1.Text.Trim().ToString());

                appConnect.Comd.Parameters.AddWithValue("@SignDateTime", System.DateTime.Now);
                appConnect.Comd.Parameters.AddWithValue("@Status", status);

                appConnect.Comd.Parameters.AddWithValue("@Emailsession", Session["userEmail"].ToString().Trim());


                appConnect.DataAdapterConnection();

                if (appConnect.Conn.State == ConnectionState.Open)

                    appConnect.CloseAll();
                ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('Congrats, you just pass a test.');", true);
                Response.Redirect("W4.aspx");
            }
            else
            {
                string message = "Oops, you have not passed a test, try it again.";
                string url = "/MathTest.aspx";
                string script = "{ alert('";
                script += message;
                script += "');";
                script += "window.location = '";
                script += url;
                script += "'; }";
                ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "alert", script, true);
            }
        }