Why does my File.HasFile always return false

问题:

The user will enter a customer number, then select a file to upload, then enter a description and press the save button. However, when I check to see if they've selected a file, it always returns false! I'd like to know why.

Edit: I am now using form with parameter enctype="multipart/form-data" and this is wrapped in an update panel. Both the form and update panel are in a master page

Here's the snippet of code that error handles and is getting the HasFile() value:

else if ( ( images.Selected == true || docs.Selected == true ) && 
                  ( Upload.HasFile == false || txtInfo.Text == string.Empty ) )
        {
            if ( Upload.HasFile == false )
                lblErrorMessage.Text = "You haven't selected a file";
            else lblErrorMessage.Text = "You must enter a description";

            validated = false;
        }

And here's the method that came from, the save button

protected void btnSaveNew_Click( object sender, EventArgs e )
    {
        bool validated = true;

        lblErrorMessage.ForeColor = System.Drawing.Color.Red;

        if ( txtCustomerNumber.Text.Length != 8 )
        {
            if ( txtCustomerNumber.Text.Length == 0 )
                lblErrorMessage.Text = "Hey! What about the customer number?";
            else if ( txtCustomerNumber.Text.Length > 8 )
                lblErrorMessage.Text = "Invalid Customer Number length (" + ( txtCustomerNumber.Text.Length - 8 ) + " char(s) too long)";
            else lblErrorMessage.Text = "Invalid Customer Number length (" + ( 8 - txtCustomerNumber.Text.Length ) + " char(s) short)";

            validated = false;
        }

        else if ( links.Selected == true && ( txtLink.Text == string.Empty || txtInfo.Text == string.Empty ) )
        {
            if ( txtLink.Text == string.Empty )
                lblErrorMessage.Text = "Hey! You forgot to enter a link!";
            else lblErrorMessage.Text = "You must enter a description";

            validated = false;
        }

        else if ( ( images.Selected == true || docs.Selected == true ) && 
                  ( Upload.HasFile == false || txtInfo.Text == string.Empty ) )
        {
            if ( Upload.HasFile == false )
                lblErrorMessage.Text = "You haven't selected a file";
            else lblErrorMessage.Text = "You must enter a description";

            validated = false;
        }

        else if ( txtInfoDesc.Text == string.Empty || txtInfo.Text == string.Empty )
        {
            if ( txtInfoDesc.Text == string.Empty )
                lblErrorMessage.Text = "You must enter an info description";
            else lblErrorMessage.Text = "You must enter info Data";

            validated = false;
        }

        if ( validated == false )
        {
            btnModify.Visible           = false;
            btnCreateNew.Visible        = false;
            ddlCustomerNumber.Visible   = false;
            btnSaveNew.Visible          = true;
            btnCancel.Visible           = true;
            txtCustomerNumber.Visible   = true;

            switch ( rblSection.SelectedIndex )
            {
                case 0: txtInfo.Visible = true;
                        txtLink.Visible = true;
                        break;
                case 1: 
                case 2: txtInfo.Visible = true;
                        Upload.Visible  = true;
                        break;
                case 3: txtInfo.Visible     = true;
                        txtInfoDesc.Visible = true;
                        break;
            }

            if ( GetCategoryIDCookie() != 0 )
                divData.Attributes.Add( "Style", "overflow:auto" );
        }
        else
        {
            addNewCustomerNumber( txtCustomerNumber.Text, txtInfoDesc.Text, txtInfo.Text );
            ddlCustomerNumber.Visible = true;
            divData.Attributes.Remove( "Style" );
            Response.Redirect( Request.RawUrl );
        }
    }

回答1:

Is there an update panel wrapped around the File Upload?

回答2:

Do you have enctype="multipart/form-data" on your form tag?

回答3:

can you post the code for the Upload class? perhaps you erroneously initialized that variable as false and somehow forgot to set it to true during some event.