พอดีมันไม่ขึ้น MessageBox อะครับ แต่ฟอร์มอื่นขึ้น งง มันเป็นเพราะอะไรผมไล่ Code ดูแล้วมันก็ไม่มีอะไรผิด รบกวนช่วยดูหน่อยครับ

 SqlConnection conn = new SqlConnection("Data Source=ART\\SQL2014;Initial Catalog=SvlIT;User ID=it;Password=1234");
                conn.Open();
                SqlCommand sqlcom = conn.CreateCommand();

                sqlcom.CommandText = "INSERT INTO [dbo].[Case] ( [CaseName], [CaseDetail], [CaseDT], [CaseStatusKey], [Requester], [UsrKey], [CaseTypeKey],[CaseCode]) VALUES ( '" + TextBox1.Text + "','" + Request.Form["Message"] + "','" + TextBox3.Text + "',1,'" + TextBox5.Text + "','" + DropDownList4.Text + "','" + DropDownList3.Text + "','"+TextBox6.Text+"')";
                //sqlcom.CommandText = "INSERT INTO [dbo].[Case] Select CaseTypeKey, CodeType, NameType From [dbo].[Case] INNER JOIN [dbo].[CaseTypeKey] ON [dbo].[Case].CaseTypeKey = [dbo].[CaseType].CaseTypeKey where CaseTypeKey = NameType ( [CaseName], [CaseDetail], [CaseDT], [CaseStatusKey], [Requester], [UsrKey], [CaseTypeKey]) VALUES" + "('" + TextBox1 + "','" + TextBox2 + "','" + TextBox3 + "','" + TextBox4 + "','" + TextBox5 + "','" + TextBox6 + "','" + Dropdownlist1 + "')";
                //sqlcom.CommandText = "INSERT INTO[dbo].[CaseType] ( [CodeType], [NameType]) VALUES" + "('" + this.TextBox2.Text + "','" + TextBox3.Text + "')";
                sqlcom.CommandType = CommandType.Text;
                sqlcom.ExecuteNonQuery();
                
                conn.Close();

                TextBox1.Text = "";
                TextBox5.Text = "";
                DropDownList3.Text = "0";
                DropDownList4.Text = "0";

                ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Myscript", "alert('บันทึกการแจ้งปัญหาสำเร็จ')", true);
                Response.Redirect("~/RequestionShow");