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copied!<p>You will need to add a <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.controlparameter.aspx" rel="nofollow noreferrer">ControlParameter</a> to <code>SelectParameters</code></p> <pre><code><asp:ControlParameter Name="entityId" ControlID="DropDownList1" PropertyName="SelectedItem" Type="String" /> </code></pre> <p>Also see this question <a href="https://stackoverflow.com/questions/5326113/how-to-specify-parameter-value-for-stored-procedure-in-sqldatasource">How to specify parameter value for stored procedure in SqlDataSource</a></p> <p><strong>Edit</strong> you can use the Selecting event as shown here </p> <p><a href="https://stackoverflow.com/questions/6048983/writing-a-sqldatasource-in-code-behind-in-c-sharp-to-use-a-code-behind-value?rq=1">Writing a SQLdatasource in code behind in C# to use a code behind value</a></p> <p>You can also add a select parameter as </p> <pre><code>EntityGrid.SelectParameters.Add("entityId", DropDownList1.SelectedItem.Text); </code></pre> <p>Just rename "entityId" to the name of parameter to be used with SP</p> <p><strong>Edit2</strong> :</p> <p>Instead of </p> <pre><code>EntityGrid.DataSource = cmd.ExecuteReader(); EntityGrid.DataBind(); </code></pre> <p>Try this</p> <pre><code>SqlDataReader reader = cmd.ExecuteReader(); using (reader) { DataTable table = new DataTable(); table.Load(reader); EntityGrid.DataSource = table; } </code></pre> <p>See this link for more :<br> <a href="http://mentaljetsam.wordpress.com/2008/11/20/loading-an-sqldatareader-into-a-datagridview/" rel="nofollow noreferrer">http://mentaljetsam.wordpress.com/2008/11/20/loading-an-sqldatareader-into-a-datagridview/</a></p>

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