Unable To Close An Ajax Modal Popup If I Open A Pdf File

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ASP.NET

Ajax

C#3.5

, +

Hi,

I am using a modal pop up to check the Accessibility of user if he success fully logs in i am allowing to open a PDF File. when i am opening the PDF File i want to close the Ajax modal popup but unable to close.
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CODE
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protected void BtnPassword_Click(object sender, EventArgs e)
{

//bool PasswordRequired = Convert.ToBoolean((dtClient.Rows[0]["PasswordRequired"].ToString() == "") ? "0" : dtClient.Rows[0]["PasswordRequired"].ToString());

byte[] _encryptPassword = TxtPassword.Text.Trim();
string _byteToText = Security.ByteArrayToString(_encryptPassword);

BLL_M_Users objusers = new BLL_M_Users();
System.Data.DataTable dtUser;
dtUser = objusers.CheckForUserAuthentication(Convert.ToString(Session["Name"]), _byteToText, Convert.ToString(Session["CompanyID"]));

if (dtUser.Rows.Count > 0)
{
ModalPopupExtender1.Hide();
GenerateReport();
}
else
{
Page.RegisterStartupScript("alert", "<script language='javascript'>alert('Incorrect Password.')</script>");
}

}


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Here is my code if in the modal popup button click i am user for user authentication if successful i am trying to close the modal pop up and open an pdf file but i am unable to hide the modalpopup extender.

can any one help me in solving this issue

Thanks,
Aditya.