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string strError = "";
if (username_tbx.Text=="")
{
strError += "Login Name can't be null ";
}
if (password_tbx.Text=="")
{
strError += " Password can't be null";
}
if (strError!="")
{
Response.Write("<script>window.alert("+strError+");location.href='create_an_account.aspx';</script>");
}
................