DataRow []dr=DataTable.select("type='"+combobox1.text+"'");;
        DataTable copytable = DataTable.Clone();
         for (int i = 0; i <= row.Length - 1; i++)
         {
            copytable.ImportRow((DataRow)row[i]);
        }

在用copytable绑定DataGridView

------解决方案--------------------
既然是datagridview绑定datatable的，那可以使用datatable的查询
  DataTable dt = new DataTable();
dt.Select("", "");

------解决方案--------------------
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C# code
DataRow []dr=DataTable.select("type='"+combobox1.text+"'");;
        DataTable copytable = DataTable.Clone();
         for (int i = 0; i <= row.Length - 1; i++)
         {
            copyta……