Gridview with Object Data Source Does not get Update Method.(It take same as Select Method parameters)

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C#

ASP.NET

Gridview

HI i just want to Set Editable Gridview and i used Object datasource for Define Select and update parameters. Selection is ok. But when it comes to update method ,if select my UPDATE METHOD but when it comes to next step , it always displays SELECT method parameters as Signature. then i changed the Object datasourse parameters by Code behind. but Still It displays this Error "Could not find control 'Lbl_sq' in ControlParameter 'sq'."

Code :

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
  OldValuesParameterFormatString="original_{0}"
SelectMethod="getrateGridInfo_TEST"
UpdateMethod="getrateGridInfo_TESTEDIT"  TypeName="BAL.rate_Viever" >
<SelectParameters>
<asp:ControlParameter ControlID="DropDownLis_rateCode" Name="rateCode"
PropertyName="SelectedValue" Type="String" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter ControlID="Lbl_sq" Name="sq"
PropertyName="Text" Type="String" />
<asp:ControlParameter ControlID="txtRate" Name="rate"
PropertyName="Text" Type="String" />

</UpdateParameters>
</asp:ObjectDataSource>

public DataTable getrateGridInfo_TEST(String rateCode)
      {
          string sql = "SELECT [minWeight],[maxWeight],[rate],[sq] FROM tblRateDetails WHERE rateCode='" + rateCode + "' order by minWeight";
          DataTable dt = SQLTrans.executeQuery(sql, "tbl");

          return dt;

      }

      public Void getrateGridInfo_TESTEDIT(String sq,String rate)
      {
       string sql = "UPDATE  tblRateDetails SET  rate = '" + rate + "' WHERE    sq = '"+sq+"' ";
          DataTable dt = SQLTrans.executeQuery(sql, "tbl");

          //return dt;

      }

So if anyone could help me on this matter that would be a great help for me.Thanks in Advance!!!