Getting a gridview to refresh to reflect change in parameters

I have a gridview that uses an object data source that has parameters linked to two date fields on the page.  

 I set the date values in page load, but when the page first loads, the query in the object data source, GetIssueDetails, says the date is 1/1/0001.  

Then I set the dates on the form and click a button that does a databind for the gridview, and the date in GetIssueDetails is still 1/1/001.  

If is set the dates in GetIssueDetails, the gridview shows the data for that date range.

How come GetIssueDetails isn't seeing the date values I expect?

    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
        OldValuesParameterFormatString="original_{0}" SelectMethod="GetIssueDetails"
        TypeName="Issues">
        <SelectParameters>
            <asp:FormParameter DefaultValue="" FormField="txtStartDate" Name="StartDate"
                Type="DateTime" />
            <asp:FormParameter FormField="txtEndDate" Name="EndDate" Type="DateTime" />
        </SelectParameters>
    </asp:ObjectDataSource>

    <asp:GridView ID="GridView1" runat="server" DataSourceID="ObjectDataSource1"
        EnableModelValidation="True">
    </asp:GridView>

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.txtStartDate.Text = DateTime.Today.ToShortDateString();
            this.txtEndDate.Text = DateTime.Today.ToShortDateString();
        }
    }
    protected void btnViewDetails_Click(object sender, EventArgs e)
    {
        this.GridView1.DataBind();
    }

    public static DataSet GetIssueDetails(DateTime StartDate, DateTime EndDate)
    {
        DateTime MinDate = DateTime.Parse("1/1/2011");
        string selectSQL;

        if (DateTime.Compare(StartDate, MinDate) < 0)
        {
            StartDate = DateTime.Today;
            EndDate = StartDate;
        }
Barry SweezeySoftware EngineerAsked:
Who is Participating?
 
jagrut_patelCommented:
1. Subscribe to the OnSelecting event of the ObjectDataSource

<asp:ObjectDataSource ID="ObjectDataSource1"..... OnSelecting="ObjectDataSource1_Selecting">

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2. Implement ObjectDataSource1_Selecting

protected void ObjectDataSource1_Selecting(object sender, ObjectDataSourceSelectingEventArgs e)
{
    e.InputParameters["StartDate"] = this.txtStartDate.Text;
    e.InputParameters["EndDate"] = this.txtEndDate.Text;
}

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0
 
Bob LearnedCommented:
I usually find that most of my problems with ASP.NET is when I forget about the page life cycle.  Since I don't use the ObjectDataSource, I am not sure when it calls the SelectMethod, but my guess from your testing is that it is before the values are set.

...or...

When the page is first loaded, there will not be a form field, and on post-back, the value is retrieved from the view state.
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