problem XML to Datagrid

[ryma]

I have problem to read XML source to datagrid.I can't put data subject and subsec to column and click at row show data all_topic in textbox .I try code but not show.

I want result show

Principles of Programming Languages 800

and when click Principles of Programming Languages show

Topic : Make Class
Detail : Student's Principle of Programing lang make class in 30/12/2011
Date : 2011-12-18 20:36:09
Adviser : Corets, Eva

Topic : Maeve Ascendant
Detail : After the collapse of a nanotechnology society in England Date : 2012-02-01 20:36:09
Adviser : Ralls, Kim

<?xml version='1.0' encoding='TIS-620'?>
<subjects>
	<subject name = "Principles of Programming Languages ">
		<subsec>800</subsec>
		<subdate>F-13-16</subdate>
		<all_topic>
			<topic>
				<topicname>Make Class</topicname>
				<topicdetail>Student's Principle of Programing lang make class in 30/12/2011</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2011-12-18 00:00:00</topicdate>
				<topicadviser>Corets, Eva</topicadviser>
			</topic>
			<topic>
				<topicname>Maeve Ascendant</topicname>
				<topicdetail>After the collapse of a nanotechnology society in England</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2012-02-01 20:36:09</topicdate>
				<topicadviser>Ralls, Kim</topicadviser>
			</topic>
		</all_topic>
	</subject>
	<subject name = "c Programming Languages">
		<subsec>870</subsec>
		<subdate>W-13-16</subdate>
		<all_topic>
			<topic>
				<topicname>Alseif Ascendant</topicname>
				<topicdetail>After the collapse of a nanotechnology society in England</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2012-02-01 20:36:09</topicdate>
				<topicadviser>Ralls, Kim</topicadviser>
			</topic>
		</all_topic>
	</subject>
	<subject name = "Software Engineering ">
		<subsec>800</subsec>
		<subdate>Th-13-16</subdate>
		<all_topic>
			<topic>
				<topicname>Make Class</topicname>
				<topicdetail>Student's Principle of Programing lang make class in 30/12/2011</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2011-12-18 00:00:00</topicdate>
				<topicadviser>Corets, Eva</topicadviser>
			</topic>
			<topic>
				<topicname>Make Class234</topicname>
				<topicdetail>Student's Principle of Programing lang make class in 30/12/2011</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2011-12-18 00:00:00</topicdate>
				<topicadviser>Corets, Eva</topicadviser>
			</topic>
		</all_topic>
	</subject>
	<subject name = "Software Engineering ">
		<subsec>870</subsec>
		<subdate>Tu-13-16</subdate>
		<all_topic>
			<topic>
				<topicname>Make Class</topicname>
				<topicdetail>Student's Principle of Programing lang make class in 30/12/2011</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2011-12-18 00:00:00</topicdate>
				<topicadviser>Corets, Eva</topicadviser>
			</topic>
			<topic>
				<topicname>Maeve Ascendant</topicname>
				<topicdetail>After the collapse of a nanotechnology society in England</topicdetail>
				<topictype>Make</topictype>
				<topicdate>2012-02-01 20:36:09</topicdate>
				<topicadviser>Ralls, Kim</topicadviser>
			</topic>
		</all_topic>
	</subject>
	<subject name = "Workshop in Information Technology I ">
		<subsec>880</subsec>
		<subdate>Th-9-12</subdate>
		<all_topic>
		</all_topic>
	</subject>
</subjects>

Help please........