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CRUD Operation Of DropDownList Inside GridView In ASP.NET

In this tutorial, I’ll show you how to use DropDownList inside GridView, and how to perform edit, update, delete operation on each field along with DropDownList. 

INITIAL CHAMBER

Step 1: Open Visual Studio 2010 and create an empty website. Give a suitable name gridview_demo.

Step 2: In Solution Explorer you will get your empty website. Add a web form, SQL Database. By following these steps:
For Web Form

gridview_demo (Your Empty Website) - Right Click, Add New Item, then Web Form. Name it gridview_demo.aspx.

For SQL Server Database

gridview_demo (Your Empty Website) - Right Click, Add New Item, then SQL Server Database. Add Database inside the App_Data_folder.

DATABASE CHAMBER

Step 3: Go to your Database [Database.mdf], we will create a table - tbl_Data. Go to the database.mdf - Table, then Add New table. Design your table like the following:

Table - tbl_data [Don’t forget to make ID - Identity Specification - Yes]



Figure 1: Database

DESIGN CHAMBER

Step 5: Now Open your gridview_demo.aspx file, where we create our design for binding and performing edit, delete, and update operation with dropdownlist.

Gridview_demo.aspx

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
  3. <html  
  4.     xmlns="http://www.w3.org/1999/xhtml">  
  5.     <head runat="server">  
  6.         <title></title>  
  7.     </head>  
  8.     <body>  
  9.         <form id="form1" runat="server">  
  10.             <div>  
  11.                 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"   
  12. AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" DataKeyNames="id"   
  13. onrowcancelingedit="GridView1_RowCancelingEdit"   
  14. onrowdeleting="GridView1_RowDeleting" onrowediting="GridView1_RowEditing"   
  15. onrowupdating="GridView1_RowUpdating" BackColor="White"   
  16. BorderColor="White" BorderStyle="Ridge" BorderWidth="2px" CellPadding="3"   
  17. CellSpacing="1" GridLines="None">  
  18.                     <Columns>  
  19.                         <asp:TemplateField HeaderText="Name">  
  20.                             <EditItemTemplate>  
  21.                                 <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("name") %>'>  
  22.                                 </asp:TextBox>  
  23.                             </EditItemTemplate>  
  24.                             <ItemTemplate>  
  25.                                 <asp:Label ID="Label2" runat="server" Text='<%# Bind("name") %>'>  
  26.                                 </asp:Label>  
  27.                             </ItemTemplate>  
  28.                         </asp:TemplateField>  
  29.                         <asp:TemplateField HeaderText="Email">  
  30.                             <EditItemTemplate>  
  31.                                 <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("email") %>'>  
  32.                                 </asp:TextBox>  
  33.                             </EditItemTemplate>  
  34.                             <ItemTemplate>  
  35.                                 <asp:Label ID="Label3" runat="server" Text='<%# Bind("email") %>'>  
  36.                                 </asp:Label>  
  37.                             </ItemTemplate>  
  38.                         </asp:TemplateField>  
  39.                         <asp:TemplateField HeaderText="Gender">  
  40.                             <EditItemTemplate>  
  41.                                 <asp:DropDownList ID="DropDownList2" runat="server"   
  42. SelectedValue='<%# Bind("gender") %>'>  
  43.                                     <asp:ListItem>--Select Gender--</asp:ListItem>  
  44.                                     <asp:ListItem>Male</asp:ListItem>  
  45.                                     <asp:ListItem>Female</asp:ListItem>  
  46.                                 </asp:DropDownList>  
  47.                             </EditItemTemplate>  
  48.                             <ItemTemplate>  
  49.                                 <asp:Label ID="Label4" runat="server" Text='<%# Bind("gender") %>'>  
  50.                                 </asp:Label>  
  51.                             </ItemTemplate>  
  52.                         </asp:TemplateField>  
  53.                     </Columns>  
  54.                     <FooterStyle BackColor="#C6C3C6" ForeColor="Black" />  
  55.                     <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />  
  56.                     <PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" />  
  57.                     <RowStyle BackColor="#DEDFDE" ForeColor="Black" />  
  58.                     <SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" />  
  59.                     <SortedAscendingCellStyle BackColor="#F1F1F1" />  
  60.                     <SortedAscendingHeaderStyle BackColor="#594B9C" />  
  61.                     <SortedDescendingCellStyle BackColor="#CAC9C9" />  
  62.                     <SortedDescendingHeaderStyle BackColor="#33276A" />  
  63.                 </asp:GridView>  
  64.             </div>  
  65.         </form>  
  66.     </body>  
  67. </html>
Your design looks like the following:



Figure 2: GridView

You have to look around this Property in GridView:
  1. DataKeysName: id.
  2. Auto Generate Delete Button: True.
  3. Auto Generate Edit Button : True.

In Events: [Make Double Click in each event shown below to go to the code]

  1. Row Cancelling Edit
  2. Row Deleting
  3. Row Editing
  4. Row Updating



Figure 3: Row

CODE CHAMBER

Step 6: Open your gridview_demo.aspx.cs and write some code so that our application starts working.

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Web;  
  5. using System.Web.UI;  
  6. using System.Web.UI.WebControls;  
  7. using System.Data.SqlClient;  
  8. using System.Data;  
  9.   
  10. public partial class _Default: System.Web.UI.Page  
  11. {  
  12.     SqlConnection con = new SqlConnection(@  
  13.     "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True");  
  14.     protected void Page_Load(object sender, EventArgs e)  
  15.     {  
  16.   
  17.         if (!Page.IsPostBack)  
  18.         {  
  19.             refreshdata();  
  20.         }  
  21.   
  22.     }  
  23.   
  24.     public void refreshdata()  
  25.     {  
  26.         SqlCommand cmd = new SqlCommand("select * from tbl_data", con);  
  27.         SqlDataAdapter sda = new SqlDataAdapter(cmd);  
  28.         DataTable dt = new DataTable();  
  29.         sda.Fill(dt);  
  30.         GridView1.DataSource = dt;  
  31.         GridView1.DataBind();  
  32.   
  33.     }  
  34.     protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)   
  35.     {  
  36.         GridView1.EditIndex = e.NewEditIndex;  
  37.         refreshdata();  
  38.     }  
  39.     protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)   
  40.     {  
  41.         int id = Convert.ToInt16(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());  
  42.         SqlCommand cmd = new SqlCommand("delete from tbl_data where id = @id", con);  
  43.         cmd.Parameters.AddWithValue("@id", id);  
  44.         con.Open();  
  45.         cmd.ExecuteNonQuery();  
  46.         con.Close();  
  47.         refreshdata();  
  48.   
  49.     }  
  50.     protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)   
  51.     {  
  52.         GridView1.EditIndex = -1;  
  53.         refreshdata();  
  54.     }  
  55.     protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)   
  56.     {  
  57.         int id = Convert.ToInt16(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());  
  58.         TextBox txtname = GridView1.Rows[e.RowIndex].FindControl("TextBox2") as TextBox;  
  59.         TextBox txtemail = GridView1.Rows[e.RowIndex].FindControl("TextBox3") as TextBox;  
  60.         DropDownList drpgender = GridView1.Rows[e.RowIndex].FindControl("DropDownList2") as DropDownList;  
  61.   
  62.         SqlCommand cmd = new SqlCommand("update tbl_data set name=@name, email=@email,gender=@gender where id =@id", con);  
  63.         cmd.Parameters.AddWithValue("@name", txtname.Text);  
  64.         cmd.Parameters.AddWithValue("@email", txtemail.Text);  
  65.         cmd.Parameters.AddWithValue("@gender", drpgender.SelectedItem.Text);  
  66.         cmd.Parameters.AddWithValue("@id", id);  
  67.         con.Open();  
  68.         cmd.ExecuteNonQuery();  
  69.         con.Close();  
  70.         refreshdata();  
  71.     }  
  72.   
  73. }  
OUTPUT CHAMBER



Figure 4: Output

Update



Figure 5: Update



Figure 6: Update

Show table data



Figure 7: Show data

Hope you liked it. All controls are working, you can check out. Thank you for reading. Have a good day!


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