private void BindData()
{
pager.PageSize = PagingSize;
DepartmentDal departmentDal = new DepartmentDal();
string filter = null;
if (ViewState["Filter"] != null)
{
filter = ViewState["Filter"].ToString();
}
pager.RecordCount = departmentDal.GetCount(filter);
DataTable table = departmentDal.GetAll(pageIndex, PagingSize, filter);
BindTable2GridView(gvMain, table);
}