How can we find a details view placed outside gridview inside gridview in asp.net ?

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C#

ASP.NET

Gridview

DetailsView

what i particularly want is to find details view inside gridview which is placed outside the gridview is it possible ? I want that to happen on GridView RowCommand. Everytime i try to find it the control remains null.

This is what i am doing :

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
   {


       if (e.CommandName.Equals("edit"))
       {



           int id = Convert.ToInt32(e.CommandArgument);

           string r = GridView1.DataKeys[id - 1].Value.ToString();


           GridViewRow row = GridView1.Rows[id];

            DetailsView  dv = (DetailsView)ridView1.Rows[id].FindControl("DetailsView1");  // getting it as null



           dv.DataSource = ds.Tables[0];      // Object refrence not set to instance of object: Error
           dv.DataBind();
           dv.Visible = true;



       }

Thank you.