ASP.NET Gridview Databind

Question

I have written the following code to databind a gridview control on an asp website. When I step through the code the dataview shows that it had rows and columns the databind method executes but the gridview is not visible on my webpage.
if (!IsPostBack)
{
DataSet ds = GetData();
if (ds.Tables.Count > 0)
{
DataView dv = new DataView(ds.Tables[0]);
GridView1.DataSource = dv;
GridView1.Visible = true;
GridView1.DataBind();
}
}