GRIDVIEW帮定后的列名如何取

GRIDVIEW帮定后的列名怎么取？
GridView1为自动帮定列；

GridView1.DataSource   =   ds;
GridView1.DataBind();

protected   void   GridView1_RowUpdating(object   sender,   GridViewUpdateEventArgs   e)
        {
怎么取列名？
}

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GridView gv = new GridView();
gv.Columns[0].HeaderText
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up
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HeaderText
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1L