Windows Forms: Linq To Sql using Stored Procedure in C#

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "LinqToSQL" and then click OK

Step 2: Design your form as below

Step 3: Create a Linq to sql model, then select Category table, GetProductByCateogryId stored from northwind database

You can create a GetProductByCategoryId stored as below

CREATE procedure [dbo].[GetProductByCategoryId]
(
	@CategoryId int
)
as
	select *from Products where CategoryID = @CategoryId

Step 4: Add code to handle your form as below

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace LinqToSQL
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            using(ModelDataContext db = new ModelDataContext())
            {
                //Get category from northwind database
                cboCategory.DataSource = db.Categories.ToList();
                cboCategory.DisplayMember = "CategoryName";
                cboCategory.ValueMember = "CategoryID";
                Category obj = cboCategory.SelectedItem as Category;
                if (obj != null)
                    dataGridView.DataSource = db.GetProductByCategoryId(obj.CategoryID);
            }          
        }

        private void cboCategory_SelectionChangeCommitted(object sender, EventArgs e)
        {
            Category obj = cboCategory.SelectedItem as Category;
            if (obj != null)
            {
                using(ModelDataContext db = new ModelDataContext())
                {
                    //Call stored procedure
                    dataGridView.DataSource = db.GetProductByCategoryId(obj.CategoryID);
                }
            }
        }
    }
}

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