Problem med treeview, sammanband mellan C# och SQL

protected void InsertIntoDatabase(object sender, EventArgs e)
{
//conn är då alltså databaskontakt metod som existerar i DBConnection från MySql.

//allt i conn.Connect defineras på annan plats
     conn.Connect("server","serverUsername","serverUserPassword");
     conn.SelectDatabase("SQLTable");
        
   string cmdStr =
      "insert into errand values(null, "användarnamnet här","emailadress här", "ärende kategori här", "ärende text här", 
      "svar här, skrivs in som " " som default ", "svarad av, defineras inte förrän admin har svarat på ärende", NOW(), NOW() 
}

protected void btnGoodAddShipper_Click(object sender, EventArgs e)
{
   string connStr = 
      "Server=(local);Database=Northwind;Integrated Security=SSPI";
        
   // this is good because all input becomes a
   // parameter and not part of the SQL statement
   string cmdStr =
      "insert into Shippers (CompanyName, Phone) values (" +
      "@CompanyName, @Phone)";
 
   using (SqlConnection conn = new SqlConnection(connStr))
      using (SqlCommand cmd = new SqlCommand(cmdStr, conn))
         {
             // add parameters
             cmd.Parameters.AddWithValue
                ("@CompanyName", txtCompanyName.Text);
             cmd.Parameters.AddWithValue("@Phone", txtPhone.Text);
 
             conn.Open();
             cmd.ExecuteNonQuery();
         }
}

string connStr =
               "Server=(local);Database=errands;Integrated Security=SSPI";
            string cmdStr =
               "insert into errands (username, emailadress, errandCategory, question, answer, AnsweredBy, TimeInserted, TimeAnswered) values (" +
               "@username, @emailadress, @errandCategory, @question, @answer, @AnsweredBy, @TimeInserted, @TimeAnswered)";

            using (SqlConnection conn = new SqlConnection(connStr))

            using (SqlCommand cmd = new SqlCommand(cmdStr, conn))
            {
                // add parameters
                cmd.Parameters.AddWithValue
                   ("@username", label1.Text);
                cmd.Parameters.AddWithValue
                    ("@emailadress", textBox3.Text);
                cmd.Parameters.AddWithValue
                    ("@errandCategory", textBox6.Text);
                cmd.Parameters.AddWithValue
                    ("@question", richTextBox1.Text);
                cmd.Parameters.AddWithValue
                    ("@answer", "");
                cmd.Parameters.AddWithValue
                    ("@AnsweredBy","");
                cmd.Parameters.AddWithValue
                    ("@TimeInserted", "NOW()");
                cmd.Parameters.AddWithValue
                    ("@TimeAnswered","NOW()");

                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();
            }