I have a page having a button and an AjaxFileUpload control. Each time I click the button, I save some value into ViewState, and when I upload files, I want to use the ViewState I saved, however, during the AjaxFileUpload1_UploadComplete events, no save ViewState could be found.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
return;
}
protected void AjaxFileUpload1_UploadComplete(object sender, AjaxControlToolkit.AjaxFileUploadEventArgs e)
{
int test = (int)ViewState["test"];
//... other codes
}
protected void Button1_Click(object sender, EventArgs e)
{
ViewState["test"] = 1;
}
I use VS debug tool, after I click the button1, each time the page postback, I could get the value of ViewState["test"], however, when I upload some files, and click "upload" during that postback, ViewState["test"] is null. If I click other button (not button1)
to postback after I upload files, the ViewState["test"] value is back to normal.
If I just put the ViewState["test"]=1 in Page_Load If(!IsPostBack) block, during AjaxFileUpload1_UploadComplete event, it can find the ViewState["test"].
But how can I get ViewState set in postback stage?