protected void ddl_ItemType_SelectedIndexChanged(object sender, EventArgs e) { string type = ddl_ItemType.SelectedItem.ToString(); if (type == "Any") { GridView1.DataSource = bookstorebo.filterTypeAny(type); GridView1.DataBind(); } else { GridView1.DataSource = bookstorebo.filterType(type); GridView1.DataBind(); } }