button click event not firing with file upload control

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ASP.NET

hi in my asp.net page i m using file upload control to upload file...

but when i am selecting any file and.. clicking on save button....
then my button click event not firing...

if i donot select any file in file upload control then clicking on save...

then event is firing...

i not able to understand where is the problem....

plse Help me.....

This is my button click code...

protected void Btn_Save_Click(object sender, EventArgs e)
   {
       try
       {

           if (Btn_Save.Text == "Update")
           {
               bool dis_sts;
               if (Chk_Dispos.Checked)
               {

                   dis_sts = true;
                   ProductProvider.Update_Fixed_Asset(ID, dis_sts, Convert.ToDateTime(Txt_Dis_Dt.Text).Date, (Convert.ToDouble((Txt_DisposValue.Text == "") ? "0" : Txt_DisposValue.Text)));
                   ProductProvider.Insert_JournalEntry(Convert.ToDateTime(Txt_Dis_Dt.Text).Date, "DISP", Convert.ToInt32(ddlAccrunalNominalAC.Items.FindByText("Asset Disposal").Value), ddlLocations.SelectedValue, "Fixed Asset", Convert.ToInt32("0"), (Convert.ToDouble((Txt_DisposValue.Text == "") ? "0" : Txt_DisposValue.Text)), Convert.ToDouble("0"), 0, "Null", Txt_Ref.Text, DateTime.Now, "none", DateTime.Now, 0);

               }
               else
               {
                   dis_sts = false;
               }
           }
           else
           {
               //    Upload Image

               string tempfile = null;
               string fullname = null;
               if (File_UP_Img.HasFile)
               {
                   tempfile = Path.GetFileName(File_UP_Img.FileName);
                   File_UP_Img.SaveAs(Server.MapPath("~/Upload_Asset/") + tempfile);

                   fullname = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + "_" + Txt_Ref.Text + "_" + tempfile;
                   File.Move(Server.MapPath("~/Upload_Asset/") + tempfile, Server.MapPath("~/Upload_Asset/") + fullname);
                   // FileUploadControl.SaveAs(Server.MapPath("~/") + filename);

               }

               //    Upload Document1

               string tempfile1 = null;
               string fullname1 = null;
               if (FileUpload1.HasFile)
               {
                   tempfile1 = Path.GetFileName(FileUpload1.FileName);
                   FileUpload1.SaveAs(Server.MapPath("~/Upload_Asset/") + tempfile1);

                   fullname1 = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + "_" + Txt_Ref.Text + "_" + tempfile1;
                   File.Move(Server.MapPath("~/Upload_Asset/") + tempfile1, Server.MapPath("~/Upload_Asset/") + fullname1);
                   // FileUploadControl.SaveAs(Server.MapPath("~/") + filename);

               }



               ////    Upload Document2

               string tempfile2 = null;
               string fullname2 = null;


               DateTime Date_Pu = Convert.ToDateTime(txtDate_pur.Text).Date;
               DateTime Date_capt = Convert.ToDateTime(Txt_DTCP.Text).Date;
               DateTime Date_exp = Convert.ToDateTime(Txt_Expiry_dt.Text).Date;
               DateTime Date_dis = Convert.ToDateTime(Txt_Dis_Dt.Text).Date;
               double deplif = 0;
               double deprat = 0;
               bool dis_sts;
               string meth = null;

               if (Chk_Dispos.Checked)
               {
                   dis_sts = true;
                   ProductProvider.Insert_JournalEntry(Convert.ToDateTime(Txt_Dis_Dt.Text).Date, "DISP", Convert.ToInt32(ddlAccrunalNominalAC.Items.FindByText("Asset Disposal").Value), ddlLocations.SelectedValue, "Fixed Asset", Convert.ToInt32("0"), (Convert.ToDouble((Txt_DisposValue.Text == "") ? "0" : Txt_DisposValue.Text)), Convert.ToDouble("0"), 0, "Null", Txt_Ref.Text, DateTime.Now, "none", DateTime.Now, 0);

               }
               else
               {
                   dis_sts = false;
               }

               if (Drp_method.SelectedIndex == 1)
               {
                   deplif = Convert.ToDouble((Txt_methdLife.Text == "") ? "0" : Txt_methdLife.Text);
                   meth = "STR";

                   double depamount = 0;

                   depamount = (Convert.ToDouble((Txt_PurCost.Text == "") ? "0" : Txt_PurCost.Text)) / (Convert.ToDouble((Txt_methdLife.Text == "") ? "0" : Txt_methdLife.Text));


                   double life1 = Convert.ToDouble((Txt_methdLife.Text == "") ? "0" : Txt_methdLife.Text);

                   int life = Convert.ToInt32(life1 * 12);
                   DateTime datejournal = Convert.ToDateTime(Txt_DTCP.Text).Date; ;





                   for (int i = 0; i < life; i++)
                   {
                       datejournal = Date_capt.AddMonths(i);
                       ProductProvider.Insert_JournalEntry(datejournal, "FIASS", Convert.ToInt32(ddlNominalAccount.SelectedValue), ddlLocations.SelectedValue, "Fixed Asset", Convert.ToInt32("0"), Convert.ToDouble("0"), depamount, 0, "Null", Txt_Ref.Text, DateTime.Now, "none", DateTime.Now, 0);
                       ProductProvider.Insert_JournalEntry(datejournal, "FIASS", Convert.ToInt32(ddlAccrunalNominalAC.SelectedValue), ddlLocations.SelectedValue, "Fixed Asset", Convert.ToInt32("0"), depamount, Convert.ToDouble("0"), 0, "Null", Txt_Ref.Text, DateTime.Now, "none", DateTime.Now, 0);

                   }





               }
               else if (Drp_method.SelectedIndex == 2)
               {

                   deprat = Convert.ToDouble((Txt_methodrate.Text == "") ? "0" : Txt_methodrate.Text);
                   meth = "RED";
               }

               ProductProvider.Insert_Fixed_Asset(Txt_Ref.Text, Txt_Desc.Text, Convert.ToInt32(ddlLocations.SelectedValue), Convert.ToInt32(ddlNominalAccount.SelectedValue), Convert.ToInt32(ddlAccrunalNominalAC.SelectedValue)
                   , Date_Pu, Date_capt, Convert.ToDouble(Txt_PurCost.Text), Convert.ToDouble(Txt_Qunty.Text), Date_exp, meth, deplif, deprat, dis_sts, Date_dis, 0, 0, (Convert.ToDouble((Txt_DisposValue.Text == "") ? "0" : Txt_DisposValue.Text)),fullname,fullname1,fullname2);




           }

         Response.Redirect("ShowAsset.aspx");



       }
       catch (Exception ex)
       {
           ScriptManager.RegisterStartupScript(this, this.GetType(), "temp", "<script language='javascript'>alert('" + ex.Message + "');</script>", false);
       }


   }

and this is my

aspx code

 <table>
 
   <tr>
 <td>Upload Document 1</td>
 <td>
     <asp:FileUpload ID="FileUpload1" runat="server" />
   </td>
    <td>
       <asp:LinkButton ID="LinkButton2" runat="server" onclick="LinkButton2_Click">
   </td>
  </tr>
 
 
 <tr>
 <td>Upload Image </td>
 <td>
  <asp:FileUpload ID="File_UP_Img" runat="server" />
   </td>
   <td>
       <asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click">
   </td>
  </tr>
  
 
 </table>
 
    
    
<table>
<tr>
<td>
    <asp:Button ID="Btn_Save" runat="server" Text="Save" onclick="Btn_Save_Click" 
        OnClientClick="return validatesave()" CausesValidation="False" />
</td>
</tr>

</table>