Object reference not set to an instance of an object.

Question

1.00/5 (1 vote)

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protected void Page_Load(object sender, EventArgs e)
        {
        HtmlInputFile filUpload = (HtmlInputFile)this.FindControl("filUpload");
        }

C#

protected void btnSave_Click(object sender, EventArgs e)
        {
        if (filUpload.PostedFile != null)
            {
            }
        }

<input id="filUpload" type="file" />

Im getting the error while checking the filUpload.PostedFile!=null...
Can u please help me..

Thanks in advance...

Posted 8-Apr-14 21:29pm

SViki

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Comments

Er. Puneet Goel 9-Apr-14 3:33am

are you using the same as you mentioned above or something else..! provide more details

3 solutions

Solution 1

Check your names: If FindControl cannot find a control with that exact name, it will return null - this will cause your test to try and work with a null reference and the exception will be thrown.

Posted 8-Apr-14 21:36pm

OriginalGriff

Solution 3

The error was generated by the fact that your call FindControl("filUpload") did not find your upload control, so you are using a wrong control ID, and the result is a null object.

Posted 8-Apr-14 21:41pm

Raul Iloc

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Thomas Daniels · Accepted Answer · 2014-04-08T21:38:00

Solution 2

The reason that you get the error is because the variable filUpload is null: the filUpload control could not be found, because you have not added runat="server" to it. Add runat="server":

HTML

<input id="filUpload" type="file" runat="server" />

Posted 8-Apr-14 21:38pm

Thomas Daniels

Updated 8-Apr-14 21:39pm

v2