Empty String

Hi,
I am using GridView in C#

<asp:LinkButton ID="LinkButton5" CommandArgument='<%# Eval("EmailAddress") %>' CommandName="LinkEmail" runat="server" Visible="true" HeaderStyle-Width="10%"><%#Eval("EmailAddress")%></asp:LinkButton>

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I am trying to pass email to a javascript

   protected void recordListContact_RowCommand(object sender, GridViewCommandEventArgs e)
    {


        if (e.CommandName == "LinkEmail")
        {
            string EmailAddress = e.CommandArgument.ToString();

            ScriptManager.RegisterStartupScript(this, GetType(), "myFunction", "SendEmail(" + EmailAddress + ");", true);
            

        }

    }

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But the string always returns empty, it works when passing the int. Any ideas? thanks