I am getting problems with having an unhandled exception occured when trying to execute my vb.net projects. Anyone know how to solve it??

The following is the exception Details:

System.NullReferenceException: Object reference not set to an instance of an object.

following is my codes ....




Public Sub InsertRecord()


Dim strFileName As String = System.IO.Path.GetFileName(File1.PostedFile.FileName)
Dim strDirectoryName As String = C:\Inetpub\wwwroot\....\"

If (Not (File1.PostedFile Is Nothing)) AndAlso (File1.PostedFile.ContentLength > 0) Then
Try
File1.PostedFile.SaveAs(strDirectoryName + strFileName)

Catch ex As Exception
End Try

Else
LblPopUpMsg.Text = "please select a file to upload"
End If

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.


Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:
Dim strFileName As String = System.IO.Path.GetFileName(File1.PostedFile.FileName)
Dim strDirectoryName As String = "C:\Inetpub\...\"



Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
BadSystem.AddDocument.InsertRecord() in C:\Inetpub\wwwroot\BadSystem\AddDocument.aspx.vb:140
BadSystem.AddDocument.btnSave_Click(Object sender, EventArgs e) in C:\Inetpub\wwwroot\BadSystem\AddDocument.aspx.vb:71
System.Web.UI.WebControls.Button.OnClick(EventArgs e)
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
System.Web.UI.Page.ProcessRequestMain()

the error is point that the the HTML control input File is not declared as new class.

so how do it to declare new class for the HTML contriol? Following is the codes...can u help me declare new class for it...i really got stucks of this..

Dim strFileName As String = System.IO.Path.GetFileName(File1.PostedFile.FileName)

Anyone know how to declare new member for

Dim strFileName As String = System.IO.Path.GetFileName(File1.PostedFile.FileName)

I use vb.net for writing my coding...so?