C# DataGridView控件綁定數據后清空數據

//1.this.dataGridView1.DataSource = null;//會將DataGridView的列也刪掉
//2.this.dataGridView1.Columns.Clear(); //異常
//3.重新綁定之前的DataTable,然后清除DataTable中的數據完美解決
  DataTable  dt  =  (DataTable)dataGridView1.DataSource;
  dt.Rows.Clear();
  dataGridView1.DataSource  =  dt;