C# - Passing QueryString Into Another Entity Framework Page?

I have a web form (Page1.aspx) in which I am passing an ID as query string to another page (Page2.aspx). Now in this page I have EntityDataSource which binds to GridView. How should I populate this gridview with that ID?

Eg. If my ID is 1056, then in my DataGridView in Page2.aspx should populate elements of this ID.

This is the code:

protected void Page_Load(object sender, EventArgs e)
{
string getEntity = Request.QueryString["EntityID"];
int getIntEntity = Int32.Parse(getEntity);
if (getIntEntity != 0)
{
//What should I do here???
}
}