dynamic GridView with bound fields not working in my page

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C#

ASP.NET

Gridview

in my aspx page(derived from a masterpage) i included a dynamic gridview as follows-
SqlDataSource Data = new SqlDataSource("System.Data.Odbc", _connection.ConnectionString, Cmd);
GridView MainGridView = new GridView();

BoundField bfield1 = new BoundField();
bfield1.HeaderText = "Topics";
bfield1.DataField = "TopicsCount";
MainGridView.Columns.Add(bfield1);

BoundField bfield2 = new BoundField();
bfield2.HeaderText = "Posts";
bfield2.DataField = "PostsCount";
MainGridView.Columns.Add(bfield2);
MainGridView.AutoGenerateColumns = false;
MainGridView.Caption = " <div class=\"main-head\"><h2 class=\"hn\">" + i + "</span></h2></div>";
MainGridView.DataSource = Data;
MainGridView.DataBind();

here the TopicsCount and PostsCount comes from the query string i did not include here.there is no problem with SqlDataSource and query.when i run the site i do not see GridView with data!.please give me practical solution.