C# Control Function Load order

I am trying to have a dropdownlist set a temporary variable in the ViewState: ViewState["TempProductVariantId"]. Once it is set and the page reloads, I want to use that variable inside a function. After that function is complete the ViewState["TempProductVariantId"] is set to 0. My issue is I need to know what order the default functions load in the control. Ie. Page_Load, OnPreRender, SelectedIndexChange, etc...

DropDownList SelectedIndexChange

protected void ArtistArtwork_SelectedIndexChange(object sender, EventArgs e)
{
    DropDownList ddl = sender as DropDownList;
    TempProductVariantId = int.Parse(ddl.SelectedValue);
}
开发者_StackOverflow

Page Load

protected void Page_Load(object sender, EventArgs e)
{
    CreateAttributeControls();
    TempProductVariantId = 0;    
}

The problem with this is it work's literally every other time I change the selected index on the DropDownList.

So again I want to set it, use it, discard it. Any tips would be appreciated.

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You need to look at the ASP.NET Page Life Cycle Overview. Specifically look at the Control Events. To answer your specific example though, ArtistArtwork_SelectedIndexChange is running after Page_Load.

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The asp.net page lifecycle overview can be found here: http://msdn.microsoft.com/en-us/library/ms178472.aspx but basically its Page_init -> Viewstate loaded -> Page_Load -> Events Fire -> Page_PreRender -> ViewState Saved -> Page_Render. Another trick you can use is to only initialize state variables on initial load by checking Page.IsPostBack (true on subsequent loads of the page)

Hope this helps.