Calling server side function on fileupload text change in asp.net

How to Post a page to server on fieupload path change by client in asp.net.
Here is a code for doing postback when u click on browse button of a file upload and choose a file then
Page posted to the server through linkbutton refrence and server involk the linkbutton_click event and you can
upload your file at linkbutton click event.

//****************Code of .Aspx File**************

<asp:FileUpload ID="fu" onChange="FileUploadPostBack();"
runat="server" />

<asp:LinkButton ID="lblAddMore" runat="server" OnClick="lblAddMore_Click"> </asp:LinkButton>

//****************Code of CS File**************

  protected void Page_Load(object sender, EventArgs e)

    {

        string jscript = "function FileUploadPostBack(){" + ClientScript.GetPostBackEventReference(lblAddMore.UniqueID, "") + "};";

        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "Key", jscript, true);

    }

    protected void lblAddMore_Click(object sender, EventArgs e)

    {

        if (fu.HasFile)

        {

            //Upload your file here.

        }

    }

Posted in: ASP.NET,ASP.NET UTILITY FUNCTIONS,FILE_UPLOAD