Question

In my asp.net application i have a gridview control, in which i added a template column with fileupload control.
And outside the gridview in the page i have a button control which performs some task.
My issue is that when i click the button, the file which i chosen via file upload control in gridview has get refreshed and the file path vanishes.
How can i stop refreshing the gridiew when i click the button.
Button is not inside the grid.

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();

            DataColumn dc1 = new DataColumn("id", typeof(string));
            dt.Columns.Add(dc1);
            dr = dt.NewRow();
            dr[0] = "abcd";
            dt.Rows.Add(dr);
            DataSet ds = new DataSet();
            ds.Tables.Add(dt);
            GridView1.DataSource = ds;
            GridView1.DataBind();
        }
    }

Answer 1

File upload control is not designed to maintain filepath on poskback.. but you can have a workaround of it.. try storing filepaths in session variables.. i know it bit clumsy but seems like the only way to do this.. one more thing you can do to lessen you effort is to create a UserControl that will manage this for you…

//If first time page is submitted and we have file in FileUpload control but not in session
        // Store the values to SEssion Object
        if (Session["FileUpload1"] == null && FileUpload1.HasFile)
{
Session["FileUpload1"] = FileUpload1;
Label1.Text = FileUpload1.FileName;
}
// Next time submit and Session has values but FileUpload is Blank
        // Return the values from session to FileUpload
        else if (Session["FileUpload1"] != null && (! FileUpload1.HasFile))
{
FileUpload1 = (FileUpload) Session["FileUpload1"];
Label1.Text = FileUpload1.FileName;
}
// Now there could be another sictution when Session has File but user want to change the file
        // In this case we have to change the file in session object
        else if (FileUpload1.HasFile)
{
Session["FileUpload1"] = FileUpload1;
Label1.Text = FileUpload1.FileName;
}

for more info

http://www.codeproject.com/Tips/101834/How-to-Maintain-FileUpload-Control-s-State-after-P.aspx

Regards