added

Dapper_Example/Dapper_Example.csproj

@@ -53,6 +53,7 @@
     <Compile Include="Entities\Abstract\BaseEntity.cs" />
     <Compile Include="Entities\Concretes\Categories.cs" />
     <Compile Include="Entities\Concretes\Employees.cs" />
+    <Compile Include="Entities\Concretes\OrderDetails.cs" />
     <Compile Include="Entities\Concretes\Products.cs" />
     <Compile Include="Form1.cs">
       <SubType>Form</SubType>

Dapper_Example/Entities/Concretes/Employees.cs

@@ -18,9 +18,7 @@ public class Employees : BaseEntity
         public int EmployeeID { get; set; }
         public string FirstName { get; set; }
         public string LastName { get; set; }
-        public string Title { get; set; }
-        public string TitleOfCourtesy { get; set; }
-        public DateTime BirthDate { get; set; }
-
+
+        public string Country { get; set; }
     }
 }

Dapper_Example/Entities/Concretes/OrderDetails.cs

@@ -0,0 +1,17 @@
+using Dapper_Example.Entities.Abstract;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Dapper_Example.Entities.Concretes
+{
+ public class OrderDetails : BaseEntity
+    {
+        public int OrderID { get; set; }
+        public decimal UnitPrice { get; set; }
+        public int Quantity { get; set; }
+        public decimal Discount { get; set; }
+    }
+}

Dapper_Example/Entities/Concretes/Products.cs

@@ -14,6 +14,8 @@ public  class Products : BaseEntity
         [Key]
         [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
         public int ProductID { get; set; }
+
+        public int CategoryID { get; set; }
         public string ProductName { get; set; }
         public decimal UnitPrice { get; set; }
         public int UnitsInStock { get; set; }

Dapper_Example/Form1.cs

@@ -66,7 +66,52 @@ private void btnExample_4_Click(object sender, EventArgs e)
 
         private void btnExample_5_Click(object sender, EventArgs e)
         {
-
+            using (IDbConnection con = new SqlConnection("Server =DESKTOP-DF88VQJ;Database=Northwind;Integrated Security=True;"))
+            {
+                con.Open();
+                dataGridView1.DataSource = con.Query("Select OrderID, Sum(Quantity) [Satılan Ürün] from [Order Details] group by OrderID").ToList();
+                con.Close();
+            }
+        }
+
+        private void btnExample_6_Click(object sender, EventArgs e)
+        {
+            using (IDbConnection con = new SqlConnection("Server =DESKTOP-DF88VQJ;Database=Northwind;Integrated Security=True;"))
+            {
+              con.Open();
+              dataGridView1.DataSource = con.Query("Select OrderID,Sum(UnitPrice * Quantity * (1 - Discount)) as [Tutar] from [Order Details] group by OrderID order by 2 desc").ToList();
+              con.Close();
+            }
+        }
+        private void btnExample_7_Click(object sender, EventArgs e)
+        {
+            using (IDbConnection con = new SqlConnection("Server =DESKTOP-DF88VQJ;Database=Northwind;Integrated Security=True;"))
+            { 
+              con.Open();
+              dataGridView1.DataSource = con.Query("Select OrderID, Sum(Quantity) as [Adet] from [Order Details] group by OrderID having sum(Quantity)> 100 order by 2 desc").ToList();
+              con.Close();
+            }
+        }
+        private void btnExample8_Click(object sender, EventArgs e)
+        {  
+            //Count
+            using (IDbConnection con = new SqlConnection("Server =DESKTOP-DF88VQJ;Database=Northwind;Integrated Security=True;"))
+            {
+                con.Open();
+                dataGridView1.DataSource = con.Query("select Country, Count(*) as [Çalışan Sayısı] from Employees group by Country").ToList();
+                con.Close();
+            }
+        }
+        private void btnExample_9_Click(object sender, EventArgs e)
+        {
+            //Join
+            using (IDbConnection con = new SqlConnection("Server =DESKTOP-DF88VQJ;Database=Northwind;Integrated Security=True;"))
+            {
+              con.Open();
+              dataGridView1.DataSource = con.Query("select c.CategoryID,c.CategoryName, p.ProductID,p.ProductName from Categories c join Products p on c.CategoryID = p.CategoryID ").ToList();
+              con.Close();
+            }
+
         }
     }
 }