Sqldatasource control set dynamic Connectionstring in .aspx page only


Set Dynamic ConnectionString to SqlDataSource ASP.NET Control Inside GridView Template

Intro: The SqlDataSource control enables you to use a Web server control to access data that is located in a relational database. You can use the SqlDataSource control with data-bound controls such as the GridView, FormView, and DetailsView controls to display and manipulate data on an ASP.NET Web page, using little or no code.


Here in this article I am writing how to set Dynamically ConnectionString Attribute on  SqlDataSource ASP.NET Control. Setting connection string for SqlDataSource control can de done programmatically in the code-behind ie (.aspx.cs) file.   On Page_Load:
SqlDataSource1.ConnectionString = yourconnectionstring;

If the SqlDataSource control is  inside the FooterTemplate of a GridView control then it will not be accessible at Page_Load. Here's the challenging task how to set ConnectionString on SqlDatasource control under Gridview Templates. By following below steps you can achieve this: Step 1: Here sample code of gridview templates:
<footertemplate> <asp:dropdownlist autopostback="True" datasourceid="sqldsWorkcategory" datatextfield="name_wt" datavaluefield="id_wt" id="cmbfWorkCategory" onselectedindexchanged="cmbfWorkCategory_SelectedIndexChanged" runat="server" width="118"> </asp:dropdownlist> <asp:sqldatasource connectionstring="&lt;%$ RepConnectionString: " getconnection="getconnection">" id="sqldsWorkcategory" runat="server" selectcommand="SELECT [id_wt], [name_wt] FROM [yourtablename]"&gt; </asp:sqldatasource> </footertemplate>
Step 2: Now edit your web.config file As i have many connection so have make a diifernt XML file to store all connections key
<configsource onstring.xml="onstring.xml" pp_data="pp_data"> <!-- Now Add this pieace of code under Compilation as u can see. --> <compilation debug="true" targetFramework="4.0"> <expressionbuilders> <add expressionprefix="RepConnectionString" type="RepConnectionStringExpressionBuilder"> </add></expressionbuilders></configsource>
Step 3: Add class file inside App_code. Have named as CodeExpressionBuilder.cs. Note: using System.CodeDom; is needed if u find error then add refference or google for this namespace, Code of CodeExpressionBuilder.cs just copy as it is.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Compilation;
using System.Configuration;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Collections.Generic;
using System.Xml.Linq;
using System.Xml;
using System.CodeDom;

//this is what we set in .aspx page (ie sqldatacource control)
public class RepConnectionStringExpressionBuilder : ExpressionBuilder

public override CodeExpression GetCodeExpression(BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
 CodeTypeReferenceExpression thisType = new CodeTypeReferenceExpression(base.GetType());
 CodePrimitiveExpression expression = new CodePrimitiveExpression(entry.Expression.Trim().ToString());
 string evaluationMethod = "GetConnectionString"; //
 return new CodeMethodInvokeExpression(thisType, evaluationMethod, new CodeExpression[] { expression });
public static string GetConnectionString(string expression)
 string getcon1='Some thing lke ur connectionstring... form xml'
 SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings[getcon1].ConnectionString);
 string wConnString = conn.ConnectionString;
 return wConnString;

This will set your dynamic ConnectionString for SqlDataCource control on .aspx page. Debug n get the flow of code.Enjoy.......

Thank you for reading, pls keep visiting this blog and share this in your network. Also, I would love to hear your opinions down in the comments.

PS: If you found this content valuable and want to do a favor, then Buy me a coffee

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  1. Anonymous 05/21/2012 09:50:35
    Works like a charm, thanks!
  2. Satinder singh 05/30/2012 19:58:28
    My pleasure...
    If its helps anyone