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 of how to set ConnectionString on SqlDatasource control under Gridview Templates.
By following the 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="<%$ RepConnectionString: " getconnection="getconnection">" id="sqldsWorkcategory" runat="server" selectcommand="SELECT [id_wt], [name_wt] FROM [yourtablename]"> </asp:sqldatasource>
</footertemplate>
Step 2:
Now edit your web.config file
As I have many connections so have to make a different 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>
Note: using System.CodeDom; is needed
if u find an error then add a reference 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)
[ExpressionPrefix("RepConnectionString")]
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.
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