我的sql查询命令“ INSERT INTO”是否存在问题？

Question

我的查询命令未将值插入表中。

我已仔细检查以确保我已正确连接到SQL Server。运行代码时没有任何错误，但是当我执行nonquery函数时，它始终返回0，这意味着我的查询不成功。我查看了所有资源。我的语法似乎正确，但是我不确定。

Form1.cs（我的应用程序的添加数据按钮的用户界面）

public partial class Storage : Form
{
    storageMLGW s = new storageMLGW();

    public Storage()
    {
        InitializeComponent();
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        s.Manufacturer = textBoxManufacturer.Text;
        s.Model = textBoxModel.Text;
        s.SerialNo = textBoxSerialNo.Text;
        s.Item_Type = textBoxItemType.Text;
        s.Building = textBoxBuilding.Text;
        s.RoomNo = textBoxRoomNo.Text;
        s.FaxNo = textBoxFaxNo.Text;
        s.IP_Address = textBoxIPAddress.Text;
        s.UserAssigned = textBoxUserAssigned.Text;
        s.AreaName = textBoxAreaName.Text;
        s.AreaNo = textBoxAreaNo.Text;

        bool isSuccess = s.Insert(s);
        if (isSuccess == true)
        {
            MessageBox.Show("New Product successfully inserted.");
        }
        else
        {
            MessageBox.Show("Failed to add new product. Try again.");
        }
    }
}

storageMLGW.cs

class storage MLGW
{
    //Getters and setters
    public int ProductID { get; set; }
    public string Manufacturer { get; set; }
    public string Model { get; set; }
    public string SerialNo { get; set; }
    public string Item_Type { get; set; }
    public string Building { get; set; }
    public string RoomNo { get; set; }
    public string FaxNo { get; set; }
    public string IP_Address { get; set; }
    public string UserAssigned { get; set; }
    public string AreaName { get; set; }
    public string AreaNo { get; set; }

    static string myconnstring =    ConfigurationManager.ConnectionStrings["connstring"].ConnectionString;

    public bool Insert(storageMLGW s)
    {
        bool isSuccess = false;
        SqlConnection conn = new SqlConnection(myconnstring);
        try
        {
            string sql = "INSERT INTO storage_mlgw (Manufacturer, Model,      SerialNo, Item_Type, Building, RoomNo, FaxNo, IP_Address, UserAssigned, AreaName, AreaNo) " +
                "VALUES(@Manufacturer, @Model, @SerialNo, @Item_Type, @Building, @RoomNo, @FaxNo, @IP_Address, @UserAssigned, @AreaName, @AreaNo)";

            SqlCommand cmd = new SqlCommand(sql, conn);

            cmd.Parameters.Add("@Manufacturer", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@Model", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@SerialNo", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@Item_Type", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@Building", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@RoomNo", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@FaxNo", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@IP_Address", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@UserAssigned", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@AreaName", SqlDbType.VarChar, 50);
            cmd.Parameters.Add("@AreaNo", SqlDbType.VarChar, 50);

            cmd.Parameters["@Manufacturer"].Value = s.Manufacturer;
            cmd.Parameters["@Model"].Value = s.Model;
            cmd.Parameters["@SerialNo"].Value = s.SerialNo;
            cmd.Parameters["@Item_Type"].Value = s.Item_Type;
            cmd.Parameters["@Building"].Value = s.Building;
            cmd.Parameters["@RoomNo"].Value = s.RoomNo;
            cmd.Parameters["@FaxNo"].Value = s.FaxNo;
            cmd.Parameters["@IP_Address"].Value = s.IP_Address;
            cmd.Parameters["@UserAssigned"].Value = s.UserAssigned;
            cmd.Parameters["@AreaName"].Value = s.AreaName;
            cmd.Parameters["@AreaNo"].Value = s.AreaNo;

            conn.Open();

            int rows = cmd.ExecuteNonQuery();

            if (rows > 0)
            {
                isSuccess = true;
            }
            else
            {
                isSuccess = false;
            }

            catch(Exception ex)
            {

            }
            finally
            {
                conn.Close();
            }
        return isSuccess;
    }
}

我希望输出返回true并显示消息框“产品已成功添加”。而是，Insert方法返回false。