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

Posted by on Wednesday, December 16, 2009 · Leave a Comment 

Sql Command Update Statement

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

Prerequistes:

  1. Install Visual Studio 2022
  2. Watch this video to enable web forms in Visual Studio 2022 Enable Web Forms websites in Visual Studio 2022
  3. Install SQL Server Express
  4. Download Northwind Database
  5. Attach Northwind 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 adding new web forms.

Instructions:

  1. Use Visual Studio 2022
  2. Create new web site;
    • Select Create New Project
    • Select ASP.NET Web Forms Site Template
    • name of project could be CSharp_ASPNET_Syntax
    • name of solution could be CSharp_ASPNET_Syntax.
  3. Add New folder named “Database_ADONET”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: Database_ADONET
  4. 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
  5. Click on copy code in code below to copy code into web form SqlCommandUpdate.aspx
  6. Click on copy code in second set of code below to copy code into code-behind SqlCommandUpdate.aspx.cs
  7. 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

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SqlCommandUpdate.aspx.cs" Inherits="Database_ADONET_SqlCommandUpdate" %>
 
 
 
 
 
    <title></title>
 
 
    <form id="form1" runat="server">
 
<div>
 
<table>
 
<tbody>
<tr>
 
<td>Find this First Name:</td>
<td>
        <asp:textbox id="txtFirstName" runat="server"></asp:textbox>
</td>
 
</tr>
 
 
<tr>
 
<td>Update Last Name with this:</td>
<td>
        <asp:textbox id="txtLastName" runat="server"></asp:textbox>
</td>
 
</tr>
 
</tbody>
</table>
 
        <asp:button id="btnUpdate" runat="server" text="Update" onclick="btnUpdate_Click">
        <asp:label id="lblErrMsg" runat="server" text="lblErrMsg" forecolor="#FF3300" visible="False"></asp:label>
        <asp:gridview id="GridView1" runat="server" datasourceid="sdsEmployees">
        </asp:gridview>
        <asp:sqldatasource id="sdsEmployees" runat="server" connectionstring="<%$ ConnectionStrings:Northwind_ConnectionString %>" selectcommand="SELECT [FirstName], [LastName] FROM [Employees]">
        </asp:sqldatasource>
    </asp:button></div>
 
    </form>

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

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
 
partial class Database_ADONET_SqlCommandUpdate : System.Web.UI.Page
{
 
    protected void btnUpdate_Click(object sender, System.EventArgs e)
    {
        SqlConnection thisConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["Northwind_ConnectionString"].ConnectionString);
 
        //Create Command object
        SqlCommand nonqueryCommand = thisConnection.CreateCommand();
 
        try
        {
            // Open Connection
            thisConnection.Open();
 
            // 1. Create Command
            // Sql Update Statement
            string updateSql = "UPDATE Employees " + "SET LastName = @LastName " + "WHERE FirstName = @FirstName";
            SqlCommand UpdateCmd = new SqlCommand(updateSql, thisConnection);
 
            // 2. Map Parameters
 
            UpdateCmd.Parameters.Add("@FirstName", SqlDbType.NVarChar, 10, "FirstName");
 
            UpdateCmd.Parameters.Add("@LastName", SqlDbType.NVarChar, 20, "LastName");
 
 
            UpdateCmd.Parameters["@FirstName"].Value = txtFirstName.Text;
            UpdateCmd.Parameters["@LastName"].Value = txtLastName.Text;
 
            UpdateCmd.ExecuteNonQuery();
        }
 
        catch (SqlException ex)
        {
            // Display error
            lblErrMsg.Text = ex.ToString();
            lblErrMsg.Visible = true;
        }
 
        finally
        {
            // Close Connection
            thisConnection.Close();
 
        }
        GridView1.DataBind();
    }
 
    protected void Page_Load(object sender, System.EventArgs e)
    {
        lblErrMsg.Visible = false;
 
    }
}

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

<connectionstrings>
<add name="Northwind_ConnectionString" connectionstring="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI">
</add><add name="Pubs_ConnectionString" connectionstring="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI">
</add></connectionstrings>

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