dataGridView1.Rows.Clear();
            dataGridView1.DataSource = null;
            //  dataGridView1.DataMember=null;
            dataGridView1.DataBindings.Clear();
            dataGridView1.RowTemplate.Cells.Clear();
            long totalMemory = GC.GetTotalMemory(false);
            GC.Collect(0, GCCollectionMode.Forced);