How do I implement flow control to control whether or not a method is executed? Page Load?

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C#

.NET

.NET4

I have a webform that returns filled out if there is an existing entry made in a search page. The issue I'm having is in the Page Load section of aspx.cs file. Code below:

protected void Page_Load(object sender, EventArgs e)
        {
            Master.PageTitle = "Account Tracker";
            //Clears Info Messages
            uxInfoMsg.DisplayMessage("", InfoMessage.InfoMessageType.Warning);
            //uxModalInfoMsg.DisplayMessage("", InfoMessage.InfoMessageType.Warning);
            if (!IsPostBack)
            {// Get ID from URL
                int urlTransferReqestID = -1;
                if (Request.QueryString["EntryID"] != null)
                {
                    urlTransferReqestID = DataConverter.StringToInteger(HttpUtility.UrlDecode(Request.QueryString["EntryID"]));
                    FillForm(urlTransferReqestID);

                }
                FillControls();
            }
        }

The issue that I'm having is that the FillControls Method is overwriting previously selected items with the default Fill Control value. For example is there is an entry where the user indicated the value for dropdown1 = John Doe. The FillControls() is resetting the form and more specifically the control to read "--Please Select A Person--"

If there is an existing Entry ID I want the user to have the ability to update the DropDownList to someone else but I also want the control to default to the previously entered value.

I'll do my best to answer any questions you may have.