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GridView_ClassM.DataSource = ds;
GridView_ClassM.DataKeyNames = new string[] { "SmallClassID" };
GridView_ClassM.DataBind();
for (int i=0; i < ds.Tables[0].Rows.Count; i++)
{
//跳到第二分页后,就出索引值错误???????????
DropDownList ddl = (DropDownList)GridView_ClassM.Rows[i].FindControl("DropDownList_BigClass");
ddl.SelectedValue = ds.Tables[0].Rows[i].ItemArray[2].ToString();
ddl.Enabled = false;
}