Not getting ComboBox selected value from devExpress GridView on button click

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C#

ASP.NET

DevExpress

when i select combobox in a gridview and click button which is outside gridview i need a selected value of combobox, which i am not getting please help.

<dx:ASPxPanel ID="ASPxPanel1"  runat="server" Width="100%" Height="100%" ScrollBars="Auto">
            <PanelCollection>
                <dx:HtmlEditorRoundPanelContent>
                <dx:ASPxGridView ID="gdsurveyinfo"  runat="server" KeyFieldName="csurveyid"
                    >
                    <ClientSideEvents RowClick="function(s,e){OnGridSelectionChanged(s,e);}"/>
                    <Columns>
                          <dx:GridViewCommandColumn ShowSelectCheckbox="True" VisibleIndex="0" Caption="Select" Width="5%" Name="colSelect">
                          </dx:GridViewCommandColumn>
                          <dx:GridViewDataDateColumn  FieldName="monthdate" VisibleIndex="1" Caption="MONTH" Width="7%">
                              <PropertiesDateEdit DisplayFormatString="MMM-yyyy" >

                              </PropertiesDateEdit>
                              <CellStyle HorizontalAlign="Center" Font-Bold="False">
                              </CellStyle>
                          </dx:GridViewDataDateColumn>                          
                      </Columns>
                      <SettingsBehavior AllowSelectByRowClick="true" AllowSelectSingleRowOnly="True" />
                    <SettingsPager Visible="False" Mode="EndlessPaging">
                    </SettingsPager>
                    <Settings VerticalScrollBarStyle="Virtual" />
                    <Paddings PaddingLeft="4px" />
                    <Styles>
                        <Header Font-Bold="True">
                        </Header>
                    </Styles>
                    <ClientSideEvents Init="function(s,e){fnResizeGrid(s,e);}" />
                    </dx:ASPxGridView>
                    </dx:HtmlEditorRoundPanelContent>
                    </PanelCollection>
          
            </dx:ASPxPanel>

--------------------------------
i tried this way but i am not getting

 for (int row = 0; row < gdsurveyinfo.VisibleRowCount; row++)
            {
                ASPxComboBox ddlStatus = (ASPxComboBox)gdsurveyinfo.FindRowCellTemplateControl(row, null, "colSelect");
                string status = ddlStatus.SelectedItem.ToString();
            }