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

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

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Sql Command Update Statement

Purpose: – Illustrates using Sql Command Update 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 SqlCommandUpdate 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 SqlCommandUpdate
Click on copy code in code below to copy code into web form SqlCommandUpdate.aspx
Click on copy code in second set of code below to copy code into code-behind SqlCommandUpdate.aspx.cs
Right-click on SqlCommandUpdate.aspx in solution explorer and select view in browser

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

 XML |   copy code | ?  
01 
02 <%@ Page Language="C#" AutoEventWireup="false" CodeFile="SqlCommandUpdate.aspx.cs" Inherits="Database_ADONET_SqlCommandUpdate" %>
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>Find this First Name: </td><td>
16         <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
17         </td>
18         </tr>
19         <tr>
20         <td>Update Last Name with this: </td><td>
21         <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
22         </td>
23         </tr>
24         </table><br />
25         <asp:Button ID="btnUpdate" runat="server" Text="Update" onClick="btnUpdate_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 SqlCommandUpdate.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_SqlCommandUpdate : System.Web.UI.Page
08 {
09  
10     protected void btnUpdate_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             // 1. Create Command
23             // Sql Update Statement
24             string updateSql = "UPDATE Employees " + "SET LastName = @LastName " + "WHERE FirstName = @FirstName";
25             SqlCommand UpdateCmd = new SqlCommand(updateSql, thisConnection);
26  
27             // 2. Map Parameters
28  
29             UpdateCmd.Parameters.Add("@FirstName", SqlDbType.NVarChar, 10, "FirstName");
30  
31             UpdateCmd.Parameters.Add("@LastName", SqlDbType.NVarChar, 20, "LastName");
32  
33  
34             UpdateCmd.Parameters["@FirstName"].Value = txtFirstName.Text;
35             UpdateCmd.Parameters["@LastName"].Value = txtLastName.Text;
36  
37             UpdateCmd.ExecuteNonQuery();
38         }
39  
40         catch (SqlException ex)
41         {
42             // Display error
43             lblErrMsg.Text = ex.ToString();
44             lblErrMsg.Visible = true;
45         }
46  
47         finally
48         {
49             // Close Connection
50             thisConnection.Close();
51  
52         }
53         GridView1.DataBind();
54     }
55  
56     protected void Page_Load(object sender, System.EventArgs e)
57     {
58         lblErrMsg.Visible = false;
59  
60     }
61 }
62  
63  
64  
65

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#, example, Source code, Sql Command, Update Statement

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

Sql Command Update Statement

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01
02	<%@ Page Language="C#" AutoEventWireup="false" CodeFile="SqlCommandUpdate.aspx.cs" Inherits="Database_ADONET_SqlCommandUpdate" %>
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>Find this First Name: </td><td>
16	<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
17	</td>
18	</tr>
19	<tr>
20	<td>Update Last Name with this: </td><td>
21	<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
22	</td>
23	</tr>
24	</table><br />
25	<asp:Button ID="btnUpdate" runat="server" Text="Update" onClick="btnUpdate_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_SqlCommandUpdate : System.Web.UI.Page
08	{
09
10	protected void btnUpdate_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	// 1. Create Command
23	// Sql Update Statement
24	string updateSql = "UPDATE Employees " + "SET LastName = @LastName " + "WHERE FirstName = @FirstName";
25	SqlCommand UpdateCmd = new SqlCommand(updateSql, thisConnection);
26
27	// 2. Map Parameters
28
29	UpdateCmd.Parameters.Add("@FirstName", SqlDbType.NVarChar, 10, "FirstName");
30
31	UpdateCmd.Parameters.Add("@LastName", SqlDbType.NVarChar, 20, "LastName");
32
33
34	UpdateCmd.Parameters["@FirstName"].Value = txtFirstName.Text;
35	UpdateCmd.Parameters["@LastName"].Value = txtLastName.Text;
36
37	UpdateCmd.ExecuteNonQuery();
38	}
39
40	catch (SqlException ex)
41	{
42	// Display error
43	lblErrMsg.Text = ex.ToString();
44	lblErrMsg.Visible = true;
45	}
46
47	finally
48	{
49	// Close Connection
50	thisConnection.Close();
51
52	}
53	GridView1.DataBind();
54	}
55
56	protected void Page_Load(object sender, System.EventArgs e)
57	{
58	lblErrMsg.Visible = false;
59
60	}
61	}
62
63
64
65

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