Using DropDownList bound data pages in ascx to refresh time-varying empty problems

Phenomenon:

In the ascx user control, there is a DropDownList that is first entered on this page to bind and display the data normally. Switch a few pages, or point a few other links, and then look at this DropDownList, is empty.

Solve:

Only need to put the DropDownList binding to! In Page.isnotpostback, such as:

if (! Page.IsPostBack)

{

DropDownList ddlproject = Formview1.findcontrol ("Ddlproject") as DropDownList;

DdlProject.Items.Clear ();

foreach (Project information item in coll)

{

DDLPROJECT.ITEMS.ADD (new ListItem (item). ProjectName, item. Projectid.tostring ()));

}

if (DdlProject.Items.Count > 0)

{

for (int i = 0; i < DdlProject.Items.Count; i++)

{

if (ddlproject.items[i). Value = = this. ProjectID)

{

Ddlproject.selectedindex = i;

Break

}

}

}

}

http://four-corner.appspot.com/

====2010-3-2 Update:

I'm sorry. To find the real problem.

DropDownList data binding should be processed in the DataBound event that contains this DropDownList FormView.