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<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="ÉÏ´«" OnClick="Button1_Click" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="Button1" />
</Triggers>
</asp:UpdatePanel>
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<div id="Panel1"></div>
private void ShowPanel()
{
string script = "document.getElementById('Panel1').style.display='';";
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "ShowPanel", script, true);
}
private void ClosePanel()
{
string script = "document.getElementById('Panel1').style.display='none';";
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "ClosePanel", script, true);
}


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 using System;
using System.IO;
namespace WriteLog
{
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    public class WriteInLog
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