Gv在编辑的时候如何控制TextBox的大小

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 protected void gv_PreRender(object sender, EventArgs e)
    {
        if (gv.EditIndex > -1)
       {
           int intLength = 0;
           for (int i = 1; i < gv.Rows[gv.EditIndex].Cells.Count-1; i++)
           {
               TextBox TXTb = new TextBox();
               TXTb = (TextBox)gv.Rows[gv.EditIndex].Cells[i].Controls[0];
               intLength = TXTb.Text.Length;
               intLength = intLength * 7;
               if (intLength < 50)
                   intLength = 50;
               TXTb.Width = intLength;
           }
    }
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