I found that with the flood of new possibilities with DevExpress grid view a simple functionality of selecting one row is bit hidden. After doing bit of searching in the internet I found the way and thought to share it.
The way we need to do this is by using a java script and bind that in to the RowClick event of the grid.
The java script will look like the following.
<script type="text/javascript">    
        function OnRowClick(e) {     
            //Unselect all rows     
            dxgdSearch._selectAllRowsOnPage(false);     
            //Select the row     
            dxgdSearch.SelectRow(e.visibleIndex, true);     
        }     
</script>
Then the binding to the RowClick would be as below.
<ClientSideEvents RowClick="function(s, e) { OnRowClick(e); }"></ClientSideEvents>
The outcome of this is a grid which you can select a row.
The value of the selected row can be taken as below.
dxgdSearch.GetRowValues(dxgdSearch.FocusedRowIndex, "Customer_ID")
For example in my application I used to pass the Customer Id to the Customer.aspx form as below.
- Response.Redirect("~/Customer.aspx?cusID= " + dxgdSearch.GetRowValues(dxgdSearch.FocusedRowIndex, "Customer_ID"));
 -            
 
The full source is as of below.
Page.aspx
- <asp:Content ID="Content4" ContentPlaceHolderID="MainContent" runat="server">
 - <script type="text/javascript">
 - function OnRowClick(e) {
 - //Unselect all rows
 - dxgdSearch._selectAllRowsOnPage(false);
 - //Select the row
 - dxgdSearch.SelectRow(e.visibleIndex, true);
 - }
 - </script>
 - <dx:ASPxGridView ID="dxgdSearch" ClientInstanceName="dxgdSearch" runat="server" AutoGenerateColumns="False"
 - SettingsBehavior-AllowFocusedRow="True" SettingsBehavior-AllowMultiSelection="False">
 - <ClientSideEvents RowClick="function(s, e) { OnRowClick(e); }"></ClientSideEvents>
 - <Columns>
 - <dx:GridViewDataTextColumn Name="Id" ShowInCustomizationForm="True" VisibleIndex="1"
 - Caption="Customer ID" FieldName="Customer_ID" Visible="False">
 - </dx:GridViewDataTextColumn>
 - <dx:GridViewDataTextColumn Name="Name" ShowInCustomizationForm="True" VisibleIndex="0"
 - Caption="Name" FieldName="Full_Name">
 - </dx:GridViewDataTextColumn>
 - <dx:GridViewDataTextColumn Name="TelephoneNo" ShowInCustomizationForm="True" VisibleIndex="1"
 - Caption="Tele. No." FieldName="Mobile_Number">
 - </dx:GridViewDataTextColumn>
 - <dx:GridViewDataTextColumn Name="EMail" ShowInCustomizationForm="True" VisibleIndex="2"
 - Caption="EMail" FieldName="Email">
 - </dx:GridViewDataTextColumn>
 - <dx:GridViewDataHyperLinkColumn Name="Select" VisibleIndex="3">
 - <DataItemTemplate>
 - <asp:Button ID="Button1" runat="server" CommandArgument='<%# Eval("Customer_ID") %>'
 - OnClick="Button1_Click" Text="Edit" />
 - </DataItemTemplate>
 - </dx:GridViewDataHyperLinkColumn>
 - </Columns>
 - <SettingsBehavior AllowFocusedRow="True"></SettingsBehavior>
 - <Settings ShowGroupPanel="True" ShowFilterRow="True" />
 - <Settings ShowFilterRow="True" ShowGroupPanel="True"></Settings>
 - </dx:ASPxGridView>
 - </asp:Content>
 -            
 
Page.aspx.cs
- protected void Button1_Click(object sender, EventArgs e)
 - {
 - Response.Redirect("~/Customer.aspx?cusID= " + dxgdSearch.GetRowValues(dxgdSearch.FocusedRowIndex, "Customer_ID"));
 - }
 -            
 
