Variable gridview - how do I do this?

I have some web page that has a number of different GridView objects. So for each GridView, I run the following code to bind specific data to that gridview.

For code below binds the to 20100813 grid - and I have similar code for 20100713, 20100613, etc.

protected void Exp20100813(object sender, EventArgs e)

    //Define data objects
    SqlConnection conn;
    SqlCommand comm;
    SqlDataReader reader;
    //Read the connection string from webconfig
    string connectionString = ConfigurationManager.ConnectionStrings["HostServer"].ConnectionString;
    //initialize connection
    conn = new SqlConnection(connectionString);
    comm = new SqlCommand(sqlQuery, conn);
        reader = comm.ExecuteReader();
        rGrid20100813.DataSource = reader;
        rGrid20100813.DataKeyNames = new string[] { "IDNUMBER" };

I would like to just have one set of code, where I set the ID of the gridview and then bind to it that way.

I tried to set the ID this way, but this didnt work.

    GridView rGridViewVar = new GridView();
    rGridViewVar.ID = "rGrid" + "20100813";

reader = comm.ExecuteReader();
rGridViewVar.DataSource = reader;

So how do I use a variable this way?

Probably the best bet is to make your method take a GridView as an argument rather than trying to instantiate it directly.

any help? Basically just need to know how to access a control with a variable.