A blog of ASP.NET 2.0 Samples, Articles, Reviews and Discussions. The purpose of this blog is to provide a resource to the quick information that developers need on Microsoft's new ASP.NET 2.0.

Tuesday, November 29, 2005

DropDownList with GridView

Using a DropDownList to trigger a load in a GridView is such a great feature its a shame I had to go to a beta version book to find it.

Goal: 1 DropDownList of States filtering 1 GridView of Customers



1.) Add a DataSource control to handle data ( I chose SQL Server ):


<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString
="<%$ ConnectionStrings:CustomersConnectionString %>"
SelectCommand
="SELECT DISTINC State FROM [Customers] ORDERBY State"
EnableCaching
="True" CacheDuration="300" />



Note : The connection string is from my web.config
Note : Cache because the data doesnt usually change [Just a group of States]




2.) Add a DropDownList control let's say full of States:

<asp:dropdownlist id="statesDDL" DataSourceID="SqlDataSource1"
DataTextField="State" AutoPostBack="True" runat="server" />

Note: AutoPostBack="True" to trigger the post back on change




3.) Add a Second DataSource Control with cool attributes:

<asp:sqldatasource id="SqlDataSource2"  connectionstring="<%$
"ConnectionStrings:CustomersConnectionString %
>"
SelectCommand="SELECT CustName,CustAddress,CustCity,CustPhone FROM [Customers]

WHERE State=@State">


<SelectParameters>
<asp:ControlParameter Name="State" ControlID="statesDDL" PropertyName="SelectedValue" />
</SelectParameters>

</asp:SqlDataSource>



4.) Add a GridView which will have data filtered by State:

<asp:GridView id="grid1" DataSourceID="SqlDataSource2" runat="server" />

( Dont ya just love the gridView code. )

1 Comments:

Anonymous Anonymous said...

Great, straightforward!
Thanks.

Friday, September 07, 2007 7:45:00 PM

 

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