Add More parameters on Select method

I need to
1) add a string "All" on top of my dropdown.
2) Add "MyState" parameter on Select Method of object Datasource.
3) On "ddlSt_SelectedIndexChanged" event I need to pass selected State Code to City drop down.
pl. help.

STATE:
              <asp:DropDownList ID="ddlSt" runat="server" 
              DataSourceID="OdsState"
               DataTextField="STATE_COUNTRY_NAME" 
              DataValueField="STATE_COUNTRY_CODE"
               AutoPostBack="True"   
                 onselectedindexchanged="ddlSt_SelectedIndexChanged" >
                
          </asp:DropDownList>
          <asp:ObjectDataSource ID="OdsState" runat="server" 
              OldValuesParameterFormatString="original_{0}" SelectMethod="GetData" 
              TypeName="stateTableAdapters.STATE_COUNTRYTableAdapter">
              <SelectParameters>
                  <asp:ControlParameter ControlID="ddlyr" Name="FromYear" 
                      PropertyName="SelectedValue" Type="Decimal" />
                  <asp:ControlParameter ControlID="ddlTo" Name="ToYear" 
                      PropertyName="SelectedValue" Type="Decimal" />
                  <asp:ControlParameter ControlID="RBl1" Name="mytype" 
                      PropertyName="SelectedValue" Type="String" />
              </SelectParameters>
          </asp:ObjectDataSource>
                
             <asp:ObjectDataSource ID="SrcCty" runat="server" 
                 OldValuesParameterFormatString="original_{0}" SelectMethod="GetData" 
                 TypeName="stateTableAdapters.CityTableAdapter" >
                 <SelectParameters>
                     <asp:ControlParameter ControlID="RBl1" Name="mytype" 
                         PropertyName="SelectedValue" Type="String"  />
                     <asp:ControlParameter ControlID="ddlyr" Name="FromYear" 
                         PropertyName="SelectedValue" Type="Decimal" />
                     <asp:ControlParameter ControlID="ddlTo" Name="ToYear" 
                         PropertyName="SelectedValue" Type="Decimal" />
                 </SelectParameters>
             </asp:ObjectDataSource>
            CITY: 
            <asp:DropDownList ID="ddlCity" 
                                runat="server" 
                                DataSourceID="SrcCty"   DataTextField="CITY">
            </asp:DropDownList>   &nbsp; &nbsp;
           
             <asp:ObjectDataSource ID="SrcDistt" runat="server" 
                            OldValuesParameterFormatString="original_{0}"                                    
                        TypeName="stateTableAdapters.DisttTableAdapter">
                 <SelectParameters>
                     <asp:ControlParameter ControlID="RBl1" DefaultValue="&quot;G&quot;" 
                                            Name="mytype" PropertyName="SelectedValue" Type="String" />
                     <asp:ControlParameter ControlID="ddlyr"  Name="FromYear" 
                                         PropertyName="SelectedValue"
                                          Type="Decimal" 
                                         DefaultValue="" />
                     <asp:ControlParameter ControlID="ddlTo" 
                                            DefaultValue="&quot; &quot;" 
                                            Name="ToYear" 
                                            PropertyName="SelectedValue" 
                                            Type="Decimal" />
                 </SelectParameters>
             </asp:ObjectDataSource>

very simple....first you want to add "all" at the top...
dropdownlist has a property called appendDataboundItems -> by default it is false make it true....rest is binding the dropdown by objectdatasource...

hope it works out 4 u..

I used appendDatabound for some reason everytime I click it adds up enitre list of data.
can you pl. explain me how to bind object datasource --I am very new to c#.
Pl. help
Bless you

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Thanks Raj,
I need more guidance from you.
I have a radio button control, a "fromyear" dropdown control and a "TOyear" control. which populates years accoring to radio button selection.
I need to retrieve data for state cities and distt based on these three selection --by default ALL states, cities and distt should be in drop downs as soon as user change the selection in state cities should change respectively-- hw can i do that .
Can you give me step by step instructions to make it happen pl.
thanks

My page is really slow.

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