C# ASP.NET Sql Command Delete Statement Source Code Example

Posted by asp.net videos on Wednesday, December 16, 2009 · Leave a Comment

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Sql Command Delete Statement

Purpose: – Illustrates using Sql Command Delete Statement in C-Sharp ASP.NET.

Prerequistes:

Install C# (Express or Standard Edition)
Install SQL Server Express
Download Northwind and Pubs Databases
Attach Northwind Database to Databases in Sql Express
Attach pubs Database to Databases in Sql Express

Notes:

You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

Use Visual Web Developer 2008
Create new web site;
- Click File/New Web Site
- Select ASP.NET Website Template
- Select C-Sharp for Language
- name of Web Site could be CSharp_ASPNET_Syntax.
Add New folder named "Database_ADONET"
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Database_ADONET
Add Web Form Named SqlCommandDelete to Database_ADONET folder
- Right-click Database_ADONET folder;
- add new item;
- Select Web Form
- Check place code behind in separate file
- Web Form name could be SqlCommandDelete
Click on copy code in code below to copy code into web form SqlCommandDelete.aspx
Click on copy code in second set of code below to copy code into code-behind SqlCommandDelete.aspx.cs
Right-click on SqlCommandDelete.aspx in solution explorer and select view in browser

Step 1: Click on Copy Code to Cut-n-paste code into SqlCommandDelete.aspx

 XML |   copy code | ?  
01 
02 <%@ Page Language="C#" AutoEventWireup="false" CodeFile="SqlCommandDelete.aspx.cs" Inherits="Database_ADONET_SqlCommandDelete" %>
03  
04 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
05  
06 <html xmlns="http://www.w3.org/1999/xhtml">
07 <head id="Head1" runat="server">
08     <title></title>
09 </head>
10 <body>
11     <form id="form1" runat="server">
12     <div>
13         <table>
14         <tr>
15         <td>First Name: </td><td>
16         <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
17         </td>
18         </tr>
19         <tr>
20         <td>Last Name: </td><td>
21         <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
22         </td>
23         </tr>
24         </table><br />
25         <asp:Button ID="btnDelete" runat="server" Text="Delete" onClick="btnDelete_Click" /><br />
26         <asp:Label ID="lblErrMsg" runat="server" Text="lblErrMsg" ForeColor="#FF3300" 
27             Visible="False"></asp:Label><br />
28         <asp:GridView ID="GridView1" runat="server" DataSourceID="sdsEmployees">
29         </asp:GridView>
30         <asp:SqlDataSource ID="sdsEmployees" runat="server" 
31             ConnectionString="<%$ ConnectionStrings:Northwind_ConnectionString %>" 
32             SelectCommand="SELECT [FirstName], [LastName] FROM [Employees]">
33         </asp:SqlDataSource>
34     </div>
35     </form>
36 </body>
37 </html>
38  
39

Step 2: Click on Copy Code to Cut-n-paste code into SqlCommandDelete.aspx.cs

  |   copy code | ?  
01 
02 using System;
03 using System.Data;
04 using System.Data.SqlClient;
05 using System.Configuration;
06  
07 partial class Database_ADONET_SqlCommandDelete : System.Web.UI.Page
08 {
09  
10     protected void  btnDelete_Click(object sender, System.EventArgs e)
11     {
12         SqlConnection thisConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["Northwind_ConnectionString"].ConnectionString);
13  
14         //Create Command object
15         SqlCommand nonqueryCommand = thisConnection.CreateCommand();
16  
17         try
18         {
19             // Open Connection
20             thisConnection.Open();
21  
22             // Create INSERT statement with named parameters
23             nonqueryCommand.CommandText = "DELETE Employees WHERE FirstName = @FirstName and LastName = @LastName";
24  
25             // Add Parameters to Command Parameters collection
26             nonqueryCommand.Parameters.Add("@FirstName", SqlDbType.VarChar, 10);
27             nonqueryCommand.Parameters.Add("@LastName", SqlDbType.VarChar, 20);
28  
29  
30             nonqueryCommand.Parameters["@FirstName"].Value = txtFirstName.Text;
31             nonqueryCommand.Parameters["@LastName"].Value = txtLastName.Text;
32  
33             nonqueryCommand.ExecuteNonQuery();
34         }
35  
36         catch (SqlException ex)
37         {
38             // Display error
39             lblErrMsg.Text = ex.ToString();
40             lblErrMsg.Visible = true;
41         }
42  
43         finally
44         {
45             // Close Connection
46             thisConnection.Close();
47  
48         }
49         GridView1.DataBind();
50     }
51  
52     protected void Page_Load(object sender, System.EventArgs e)
53     {
54         lblErrMsg.Visible = false;
55  
56     }
57 }
58  
59  
60

Step 3: Click on Copy Code to Cut-n-paste code into web.config right after the appSettings section

 XML |   copy code | ?  
1 
2 <connectionStrings>
3     <add name="Northwind_ConnectionString"
4       connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
5     <add name="Pubs_ConnectionString"
6       connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
7   </connectionStrings>
8  
9

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Filed under Code Samples · Tagged with asp.net, C#, Delete Statement, example, Source code, Sql Command

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C# ASP.NET Sql Command Delete Statement Source Code Example

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01
02	<%@ Page Language="C#" AutoEventWireup="false" CodeFile="SqlCommandDelete.aspx.cs" Inherits="Database_ADONET_SqlCommandDelete" %>
03
04	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
05
06	<html xmlns="http://www.w3.org/1999/xhtml">
07	<head id="Head1" runat="server">
08	<title></title>
09	</head>
10	<body>
11	<form id="form1" runat="server">
12	<div>
13	<table>
14	<tr>
15	<td>First Name: </td><td>
16	<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
17	</td>
18	</tr>
19	<tr>
20	<td>Last Name: </td><td>
21	<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
22	</td>
23	</tr>
24	</table><br />
25	<asp:Button ID="btnDelete" runat="server" Text="Delete" onClick="btnDelete_Click" /><br />
26	<asp:Label ID="lblErrMsg" runat="server" Text="lblErrMsg" ForeColor="#FF3300"
27	Visible="False"></asp:Label><br />
28	<asp:GridView ID="GridView1" runat="server" DataSourceID="sdsEmployees">
29	</asp:GridView>
30	<asp:SqlDataSource ID="sdsEmployees" runat="server"
31	ConnectionString="<%$ ConnectionStrings:Northwind_ConnectionString %>"
32	SelectCommand="SELECT [FirstName], [LastName] FROM [Employees]">
33	</asp:SqlDataSource>
34	</div>
35	</form>
36	</body>
37	</html>
38
39

01
02	using System;
03	using System.Data;
04	using System.Data.SqlClient;
05	using System.Configuration;
06
07	partial class Database_ADONET_SqlCommandDelete : System.Web.UI.Page
08	{
09
10	protected void btnDelete_Click(object sender, System.EventArgs e)
11	{
12	SqlConnection thisConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["Northwind_ConnectionString"].ConnectionString);
13
14	//Create Command object
15	SqlCommand nonqueryCommand = thisConnection.CreateCommand();
16
17	try
18	{
19	// Open Connection
20	thisConnection.Open();
21
22	// Create INSERT statement with named parameters
23	nonqueryCommand.CommandText = "DELETE Employees WHERE FirstName = @FirstName and LastName = @LastName";
24
25	// Add Parameters to Command Parameters collection
26	nonqueryCommand.Parameters.Add("@FirstName", SqlDbType.VarChar, 10);
27	nonqueryCommand.Parameters.Add("@LastName", SqlDbType.VarChar, 20);
28
29
30	nonqueryCommand.Parameters["@FirstName"].Value = txtFirstName.Text;
31	nonqueryCommand.Parameters["@LastName"].Value = txtLastName.Text;
32
33	nonqueryCommand.ExecuteNonQuery();
34	}
35
36	catch (SqlException ex)
37	{
38	// Display error
39	lblErrMsg.Text = ex.ToString();
40	lblErrMsg.Visible = true;
41	}
42
43	finally
44	{
45	// Close Connection
46	thisConnection.Close();
47
48	}
49	GridView1.DataBind();
50	}
51
52	protected void Page_Load(object sender, System.EventArgs e)
53	{
54	lblErrMsg.Visible = false;
55
56	}
57	}
58
59
60

1
2	<connectionStrings>
3	<add name="Northwind_ConnectionString"
4	connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
5	<add name="Pubs_ConnectionString"
6	connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
7	</connectionStrings>
8
9