protected void ddlBlock_SelectedIndexChanged(object sender, EventArgs e) { BusinessLayer.Common.MemberMaster objMemberMaster = new BusinessLayer.Common.MemberMaster(); int blockid = Convert.ToInt32(ddlBlock.SelectedValue); DataTable dt = new DataTable(); dt = objMemberMaster.GetDistrictAndStateByBlockId(blockid); ddlDistrict.SelectedValue = dt.Rows[0]["DistrictId"].ToString(); ddlState.SelectedValue = dt.Rows[0]["StateId"].ToString(); }