请教这种html代码怎么,为什么下面的运算不对
<TD class=secTextBody width=250>Frequent Flyer:
</TD>
<TD class=secTextBody></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE width=160 align=left border=0>
<TBODY>
<TR>
<TD class=secTextHead>Fare</TD>
<TD class=secTextHead>USD</TD>
<TD class=secTextHead align=right>1,380.00</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>US</TD>
<TD class=secTextBody align=right>32.20</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>XF</TD>
<TD class=secTextBody align=right>4.50</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>XT</TD>
<TD class=secTextBody align=right>142.00</TD></TR>
<TR>
<TD class=secTextHead>Total</TD>
<TD class=secTextHead>USD</TD>
<TD class=secTextHead
align=right>1,558.70</TD></TR></TBODY></TABLE><BR></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=0 cellPadding=0 width=760 bgColor=#d0dde7 border=0>
<TBODY>
<TR>
<TD width=15 rowSpan=2> </TD>
<TD colSpan=2>The data for each document image is displayed in ticket
detail format, even if it was originally printed in a different format.
The format of the document does not change its validity. Certain data on
this document may be replaced by ******** for security reasons.iStart = response.IndexOf("Frequent Flyer: ") + "Frequent Flyer: ".Length;
iEnd = response.IndexOf("The data for each document image is displayed in ticket detail format, even if it was originally printed in a different format. The format of the document does not change its validity. Certain data on this document may be replaced by ******** for security reasons.") - "<TD colSpan='2'>".Length;
string Fare = response.Substring(iStart, iEnd - iStart - 1);
<TD class=secTextBody width=250>Frequent Flyer:
</TD>
<TD class=secTextBody></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE width=160 align=left border=0>
<TBODY>
<TR>
<TD class=secTextHead>Fare</TD>
<TD class=secTextHead>USD</TD>
<TD class=secTextHead align=right>1,380.00</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>US</TD>
<TD class=secTextBody align=right>32.20</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>XF</TD>
<TD class=secTextBody align=right>4.50</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>XT</TD>
<TD class=secTextBody align=right>142.00</TD></TR>
<TR>
<TD class=secTextHead>Total</TD>
<TD class=secTextHead>USD</TD>
<TD class=secTextHead
align=right>1,558.70</TD></TR></TBODY></TABLE><BR></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=0 cellPadding=0 width=760 bgColor=#d0dde7 border=0>
<TBODY>
<TR>
<TD width=15 rowSpan=2> </TD>
<TD colSpan=2>The data for each document image is displayed in ticket
detail format, even if it was originally printed in a different format.
The format of the document does not change its validity. Certain data on
this document may be replaced by ******** for security reasons.iStart = response.IndexOf("Frequent Flyer: ") + "Frequent Flyer: ".Length;
iEnd = response.IndexOf("The data for each document image is displayed in ticket detail format, even if it was originally printed in a different format. The format of the document does not change its validity. Certain data on this document may be replaced by ******** for security reasons.") - "<TD colSpan='2'>".Length;
string Fare = response.Substring(iStart, iEnd - iStart - 1);
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<TABLE width=160 align=left border=0>
<TBODY>
<TR>
<TD class=secTextHead>Fare</TD>
<TD class=secTextHead>USD</TD>
<TD class=secTextHead align=right>1,380.00</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>US</TD>
<TD class=secTextBody align=right>32.20</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>XF</TD>
<TD class=secTextBody align=right>4.50</TD></TR>
<TR>
<TD class=secTextBody>Tax</TD>
<TD class=secTextBody>XT</TD>
<TD class=secTextBody align=right>142.00</TD></TR>
<TR>
<TD class=secTextHead>Total</TD>
<TD class=secTextHead>USD</TD>
<TD class=secTextHead
align=right>1,558.70</TD></TR></TBODY></TABLE><BR></TD></TR></TBODY></TABLE>
和httpWebRequest有啥关系