How to upload a file in gridview when it is in EDIT mode.

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C#

ASP.NET

SQL-Server

How to Upload a PDF file From Gridview, when it is in Editmode.
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Dear Frnds,

Am working on ASP.NET Gridview. am editing a record using Modal Popup extender...its working fine.

but i want to add File upload control also, so i can upload(REPLACE) another PDF file when it is in edit mode.

This is my Design & code.

FileUpload control in design mode.
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<asp:FileUpload ID="FileUpload_Edit" runat="server" />

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and this is my Code.

protected void btnUpdate_Click(object sender, EventArgs e)
   {
       con.Open();
SqlCommand cmd = new SqlCommand("UPDATE AddUsers SET FirstName='" + txtfname.Text + "',LastName='" + txtlname.Text + "',EmpNo='" + txtEmpNo.Text + "',Sponsor='" + txtSponsor.Text + "',ManagerName='" + txtManagerName.Text + "', Dept='" + txtDepartment.Text + "',Location='" + txtLocation.Text + "',OffTelNo='" + txtOffTelNo.Text + "',MobileNo='" + txtMobileNo.Text + "',IssuedDate='" + txtIssueDate.Text + "',ExpiryDate='" + txtExpiryDate.Text + "' Where Id=@Id", con);
 
 Collapse | Copy Code
cmd.Parameters.AddWithValue("@FirstName", txtfname.Text);
        cmd.Parameters.AddWithValue("@LastName", txtlname.Text);
        cmd.Parameters.AddWithValue("@EmpNo", txtEmpNo.Text);
        cmd.Parameters.AddWithValue("@Sponsor", txtSponsor.Text);
        cmd.Parameters.AddWithValue("@ManagerName", txtManagerName.Text);
 
        cmd.Parameters.AddWithValue("@Dept", txtDepartment.Text);
 
        cmd.Parameters.AddWithValue("@Location", txtLocation.Text);
 
        cmd.Parameters.AddWithValue("@OffTelNo", txtOffTelNo.Text);
 
        cmd.Parameters.AddWithValue("@MobileNo", txtMobileNo.Text);
 
        cmd.Parameters.AddWithValue("@IssuedDate", txtIssueDate.Text);
 
        cmd.Parameters.AddWithValue("@ExpiryDate", txtExpiryDate.Text);
        cmd.Parameters.AddWithValue("@Id", Convert.ToInt32(lblID.Text));
 
 cmd.ExecuteNonQuery();
        con.Close();
 
 ScriptManager.RegisterStartupScript(this, this.GetType(), "RunCode", "javascript:alert('Updated successfully');", true);
        BindGV();
}

Please help me.

THANKS.