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


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Sql Command Update Statement

Purpose: – Illustrates using in C-Sharp ASP.NET.

Prerequistes:

  1. Install C# (Express or Standard Edition)
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. 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:

  1. Use Visual Web Developer 2008
  2. 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.
  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

 XML |  copy code |? 
< %@ Page Language="C#" AutoEventWireup="false" CodeFile="SqlCommandUpdate.aspx.cs" Inherits="Database_ADONET_SqlCommandUpdate" %>
 
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
        <tr>
        <td>Find this First Name: </td><td>
        <asp :TextBox ID="txtFirstName" runat="server"></asp>
        </td>
        </tr>
        <tr>
        <td>Update Last Name with this: </td><td>
        <asp :TextBox ID="txtLastName" runat="server"></asp>
        </td>
        </tr>
        </table><br />
        <asp :Button ID="btnUpdate" runat="server" Text="Update" onClick="btnUpdate_Click"/><br />
        <asp :Label ID="lblErrMsg" runat="server" Text="lblErrMsg" ForeColor="#FF3300" 
            Visible="False"></asp><br />
        <asp :GridView ID="GridView1" runat="server" DataSourceID="sdsEmployees">
        </asp>
        <asp :SqlDataSource ID="sdsEmployees" runat="server" 
            ConnectionString="<%$ ConnectionStrings:Northwind_ConnectionString %>" 
            SelectCommand="SELECT [FirstName], [LastName] FROM [Employees]">
        </asp>
    </div>
    </form>
</body>
</html>
 


Step 2: Click on Copy Code to Cut-n-paste code into SqlCommandUpdate.aspx.cs
 C# |  copy code |? 
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
 XML |  copy code |? 
<connectionstrings>
    <add name="Northwind_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
    <add name="Pubs_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
  </connectionstrings>
 

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Comments

One Response to “C# ASP.NET Sql Command Update Statement Source Code Example”
  1. Milan Dutta says:

    give only update query in asp.net using c sharp pls

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