Forms Data Controls :: A Gridview Control For Displaying The Filtered Data And A Sqldatasource Control?

In my scenerio, i've a dropdownlistbox by which i want to filter, a textbox for the text to filter and two textbox for specifying from and to date.

A gridview control for displaying the filtered data and a sqldatasource control and a commandbutton called search.

The following code is used to filter the data in database and it works properly. But when i click on edit in gridview, the gridview displays no records and again when i click on search button the data is displayed on the gridview displayed with the selected row in editmode.

protected void btnSearch_Click(object sender, EventArgs e)

{
string query;[code]....