DataSource Controls :: How To Update The Database Value On Button Click

I've used below code for inserting textbox values on button click....then back the page again, if i update the textbox value , I want the corrosponding values of the database table also updated..

SqlConnection dbConn = new SqlConnection();
SqlCommand cmd = new SqlCommand();
dbConn.ConnectionString = ConfigurationManager.ConnectionStrings["Acarin_SchoolManagementConnectionString"].ToString();
if (dbConn.State != ConnectionState.Open)
dbConn.Open();
cmd.Connection = dbConn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "sproc_Ins_Student_Details";
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("@StreetName", txtstreet.Text);
cmd.Parameters.AddWithValue("@Email_Id", txtemailaddress.Text);
cmd.Parameters.AddWithValue("@WebSiteUrl", txtwebpage.Text);
cmd.Parameters.AddWithValue("@HouseType", txthousetype.Text);
cmd.Parameters.AddWithValue("@HouseNo", txthouseno.Text);
cmd.Parameters.AddWithValue("@City", txtcity.Text);
cmd.ExecuteNonQuery();