我可以在DataBind()之后关闭SqlDataReader吗

假设我做了类似的事情

using (SqlDataReader allUsersDataSource = AdminDB.GetUsers())
{
    // bind all portal users to dropdownlist
    allUsers.DataSource = allUsersDataSource;
    allUsers.DataBind();
}

dataBinded的行为是否仍然正确，还是需要SqlDataReader不显示？

编辑：附加信息

public static SqlDataReader GetUsers() 
{
    // Create Instance of Connection and Command Object
    using (SqlConnection myConnection = new SqlConnection( (string) PortalSettings.GetPortalSetting("ConnectionString")))
    using (SqlCommand myCommand = new SqlCommand("dbo.GetUsers", myConnection))
    {
        // Mark the Command as a SPROC
        myCommand.CommandType = CommandType.StoredProcedure;
        // Open the database connection and execute the command
        myConnection.Open();
        SqlDataReader dr = myCommand.ExecuteReader();
        // Return the datareader
        return dr;
    }
}

using (SqlDataReader allUsersDataSource = AdminDB.GetUsers())
   {
    // bind all portal users to dropdownlist
     allUsers.DataSource = allUsersDataSource;
     allUsers.DataBind();
   }