Add project files.

RepositoryPattern/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <connectionStrings>
+    <add name="cn" connectionString="Data Source=oemansv7win;Initial Catalog=Northwind;Integrated Security=True" providerName="System.Data.SqlClient"/>
+  </connectionStrings>
+</configuration>

RepositoryPattern/AppConnection.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RepositoryPattern
+{
+    public class AppConnection
+    {
+        public static string ConnectionString => ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
+    }
+}

RepositoryPattern/Form1.Designer.cs

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+
+namespace RepositoryPattern
+{
+    partial class Form1
+    {
+        /// <summary>
+        ///  Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        ///  Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        ///  Required method for Designer support - do not modify
+        ///  the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.dataGridView = new System.Windows.Forms.DataGridView();
+            this.lblTotalRecords = new System.Windows.Forms.Label();
+            ((System.ComponentModel.ISupportInitialize)(this.dataGridView)).BeginInit();
+            this.SuspendLayout();
+            // 
+            // dataGridView
+            // 
+            this.dataGridView.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
+            this.dataGridView.Location = new System.Drawing.Point(12, 12);
+            this.dataGridView.Name = "dataGridView";
+            this.dataGridView.RowTemplate.Height = 25;
+            this.dataGridView.Size = new System.Drawing.Size(776, 393);
+            this.dataGridView.TabIndex = 0;
+            // 
+            // lblTotalRecords
+            // 
+            this.lblTotalRecords.AutoSize = true;
+            this.lblTotalRecords.Location = new System.Drawing.Point(12, 408);
+            this.lblTotalRecords.Name = "lblTotalRecords";
+            this.lblTotalRecords.Size = new System.Drawing.Size(98, 15);
+            this.lblTotalRecords.TabIndex = 2;
+            this.lblTotalRecords.Text = "Total Records: ???";
+            // 
+            // Form1
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(800, 450);
+            this.Controls.Add(this.lblTotalRecords);
+            this.Controls.Add(this.dataGridView);
+            this.MinimizeBox = false;
+            this.Name = "Form1";
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "Repository Pattern";
+            this.Load += new System.EventHandler(this.Form1_Load);
+            ((System.ComponentModel.ISupportInitialize)(this.dataGridView)).EndInit();
+            this.ResumeLayout(false);
+            this.PerformLayout();
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.DataGridView dataGridView;
+        private System.Windows.Forms.Label lblTotalRecords;
+    }
+}
+

RepositoryPattern/Form1.cs

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+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 RepositoryPattern
+{
+    public partial class Form1 : Form
+    {
+        IProductRepository _productRepository;
+        public Form1(IProductRepository productRepository)
+        {
+            InitializeComponent();
+            _productRepository = productRepository;
+        }
+
+        private void Form1_Load(object sender, EventArgs e)
+        {
+             dataGridView.DataSource = _productRepository.GetProducts();
+            lblTotalRecords.Text = $"Total records: {dataGridView.RowCount}";
+        }
+    }
+}

RepositoryPattern/Form1.resx

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+<root>
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

RepositoryPattern/IProductRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RepositoryPattern
+{
+    public interface IProductRepository
+    {
+        IEnumerable<Product> GetProducts();
+        bool Insert(Product product);
+        bool Update(Product product);
+        bool Delete(string  productId);
+    }
+}

RepositoryPattern/Product.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace RepositoryPattern
+{
+    public class Product
+    {
+        public string ProductId { get; set; }
+        public string ProductName { get; set; }
+        public decimal UnitPrice { get; set; }
+        public string Barcode { get; set; }
+        public int UnitsInStock { get; set; }
+    }
+}

RepositoryPattern/ProductRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.SqlClient;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Dapper;
+
+namespace RepositoryPattern
+{
+    public class ProductRepository : IProductRepository
+    {
+        public bool Delete(string productId)
+        {
+            throw new NotImplementedException();
+        }
+
+        public IEnumerable<Product> GetProducts()
+        {
+            using IDbConnection db = new SqlConnection(AppConnection.ConnectionString);
+            if (db.State == ConnectionState.Closed)
+                db.Open();
+            return db.Query<Product>("select ProductId, ProductName, UnitPrice, UnitsInStock ,RIGHT('00000' + cast(ProductId as varchar) , 5) As Barcode from Products", commandType: CommandType.Text);
+        }
+
+        public bool Insert(Product product)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Update(Product product)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

RepositoryPattern/Program.cs

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+using Autofac;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace RepositoryPattern
+{
+    static class Program
+    {
+        public static IContainer Container;
+        /// <summary>
+        ///  The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.SetHighDpiMode(HighDpiMode.SystemAware);
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Container = Configure();
+            Application.Run(new Form1(Container.Resolve<IProductRepository>()));
+        }
+        /// <summary>
+        /// Setting dependency injection
+        /// </summary>
+        /// <returns></returns>
+        static IContainer Configure()
+        {
+            var builder = new ContainerBuilder();
+            builder.RegisterType<ProductRepository>().As<IProductRepository>();
+            builder.RegisterType<Form1>();
+            return builder.Build();
+        }
+    }
+}

RepositoryPattern/RepositoryPattern.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Autofac" Version="6.1.0" />
+    <PackageReference Include="Dapper" Version="2.0.78" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.2" />
+  </ItemGroup>
+
+</Project>