update parameters and select parameters

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ASP.NET

What is update and select parameters in objectdatasource ? Kindly explain me the use of objectdatasource. How to use it ?

for example in our project i found like :

<asp:ObjectDataSource ID="objUserClaimList_Approval"
             runat="server" SelectMethod="GetAllRecordsForClaimApproval"
             OnSelecting="objUserClaimList_Approval_Selecting"  
             TypeName="TMS.Business.INT_New_Claim"
             OnUpdating="objUserClaimList_Approval_Updating"
             UpdateMethod="UpdateForClaimApproval">
                       
                       <UpdateParameters>
                           <asp:Parameter Name="Reim_Token_ID" Type="Int32" />
                           <asp:Parameter Name="TP_Remark" Type="String" />
                           <asp:Parameter Name="Modified_By" Type="String" />
                           <asp:Parameter Name="Issued_Amount" Type="Decimal" />
                           <asp:Parameter Name="Own_Side" Type="Int32" />
                           <asp:Parameter Name="Approval_Status" Type="String" />
                       </UpdateParameters>
                       <SelectParameters>
                           <asp:Parameter Name="ReimApproval_sc" Type="Object" />
                           <asp:Parameter DefaultValue="1" Name="PageNo" Type="Int32" />
                           <asp:Parameter DefaultValue="1000" Name="PageSize" Type="Int32" />
                       </SelectParameters>
</asp:ObjectDataSource>