public string Put(Models_Cars mod)
        {
            try
            {
                string query = @"update dbo.Models
                        
                set ModelName= '" + mod.ModelName + @"' 
               ,Type_Chasi= '" + mod.Type_Chasi + @"' 
               ,DateOfProduction= '" + mod.DateOfProduction + @"' 
               ,PhotoFileName= '" + mod.PhotoFileName + @"'  
                    where ModelId =" + mod.ModelId + @" ";


                DataTable table = new DataTable();
                using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["CarsDB"].ConnectionString))
                    using (var cmd = new SqlCommand(query, con))
                        using (var da = new SqlDataAdapter(cmd))
                        {
                            cmd.CommandType = CommandType.Text;
                            da.Fill(table);
                        }

                return("Updated Successfully!");
            }
            catch (Exception)
            {
                return("Failed to Update!");
            }
        }
        public string Post(Models_Cars mod)
        {
            try
            {
                string    query = @"insert into dbo.Models values (

                    '" + mod.ModelName + @"'
                    ,'" + mod.Type_Chasi + @"'
                    ,'" + mod.DateOfProduction + @"'
                    ,'" + mod.PhotoFileName + @"'
                                        
                    )";
                DataTable table = new DataTable();
                using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["CarsDB"].ConnectionString))
                    using (var cmd = new SqlCommand(query, con))
                        using (var da = new SqlDataAdapter(cmd))
                        {
                            cmd.CommandType = CommandType.Text;
                            da.Fill(table);
                        }

                return("Added Successfully!");
            }
            catch (Exception)
            {
                return("Failed to Add!");
            }
        }