我正在尝试将数据插入数据库
但是按下按钮后,它会显示错误信息
无法将参数值从 String 转换为 Int32。
我需要帮助
我不知道该怎么办了。谢谢!!
private void InsertNewRecord()
            {
                SqlCommand cmdInsert = new SqlCommand();
                cmdInsert.Connection = cn;
                cmdInsert.CommandType = CommandType.Text;
                cmdInsert.CommandText = "INSERT INTO Customers (" +
                    " LastName, FirstName, MiddleName, ContactNumber, EmailAddress, BirthDate, CompanyName, Address, BillingAddress, CustomerStatus, CustPicture" +
                    ") VALUES (" +
                    " @LastName, @FirstName, @MiddleName, @ContactNumber, @EmailAddress, @BirthDate, @CompanyName, @Address, @BillingAddress, @CustomerStatus, @CustPicture" +
                    ") ";
                cmdInsert.Parameters.Add("@LastName", SqlDbType.VarChar, 50).Value = txtLastName.Text;
                cmdInsert.Parameters.Add("@FirstName", SqlDbType.VarChar, 50).Value = txtFirstName.Text;
                cmdInsert.Parameters.Add("@MiddleName", SqlDbType.VarChar, 50).Value = txtMiddleName.Text;
                cmdInsert.Parameters.Add("@ContactNumber", SqlDbType.Int).Value = txtContactNumber.Text;
                cmdInsert.Parameters.Add("@EmailAddress", SqlDbType.VarChar, 100).Value = txtEmailAddress.Text;
                cmdInsert.Parameters.Add("@BirthDate", SqlDbType.Date).Value = dtpBirthdate.Value;
                cmdInsert.Parameters.Add("@CompanyName", SqlDbType.VarChar, 50).Value = txtCompanyName.Text;
                cmdInsert.Parameters.Add("@Address", SqlDbType.VarChar, 100).Value = txtAddress.Text;
                cmdInsert.Parameters.Add("@BillingAddress", SqlDbType.VarChar, 100).Value = txtBillingAddress.Text;
                cmdInsert.Parameters.Add("@CustomerStatus", SqlDbType.VarChar, 10).Value = cboCustomerStatus.Text;
                Image bmp;
                System.IO.MemoryStream ms;
                if (PicImage.Image == null)
                {
                    bmp = Bitmap.FromFile(Application.StartupPath + @"\Anonymous.jpg"); //read the default picture
                    ms = new System.IO.MemoryStream();
                    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp); //put it in the memory stream
                    cmdInsert.Parameters.Add("@CustPicture", SqlDbType.Image).Value = ms.GetBuffer(); //add it as the value of custpictureparameter.
                }
                else
                {
                    bmp = Bitmap.FromFile(openFileDialog1.FileName);
                    ms = new System.IO.MemoryStream();
                    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
                    cmdInsert.Parameters.Add("@CustPicture", SqlDbType.Image).Value = ms.GetBuffer();
                }
                cmdInsert.ExecuteNonQuery();
                Console.WriteLine("Successfully added row to Customers table!");
            } //end of InsertNewRecord()
}