StackOverflow2013

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plurals

PO
primarykey
Id
20567733
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2013-12-13T13:29:30.973
FavoriteCount
0
LastActivityDate
2013-12-13T13:53:53.563
LastEditDate
2013-12-13T13:53:53.563
LastEditorUserId
2902555
OwnerUserId
2902555
ParentId
20567615
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
In this line: <pre><code>var query = "Select Username From Login Where Username ='" + comboBox1 + "' and Password ='" + textBox2.Text + "'"; </code></pre> You're trying to concatenate a <code>String</code> and a <code>Control</code> together. (<code>ComboBox</code> is a subclass of <code>Control</code>) This is not allowed. What you need to use is the <code>SelectedText</code> property of <code>ComboBox</code>: <pre><code>var query = "Select Username From Login Where Username ='" + comboBox1.SelectedText + "' and Password ='" + textBox2.Text + "'"; </code></pre> Incidentally, I would strongly advise using prepared statements to ensure users don't enter their own SQL code into the username and password fields, and potentially compromise the security of your database. This usually involves setting the query string with parameter names (val0, val1 etc.) instead of the raw text <code>comboBox1.SelectedText</code>, <code>textBox2.Text</code>. Information on prepared statements in Microsoft SQL: <a href="http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.prepare(v=vs.110).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.prepare(v=vs.110).aspx</a> Information on prepared statements in MySQL: <a href="http://dev.mysql.com/doc/refman/5.0/en/connector-net-programming-prepared.html" rel="nofollow">http://dev.mysql.com/doc/refman/5.0/en/connector-net-programming-prepared.html</a>
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Title
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1. This table or related slice is empty.
PostParentId
1. POUnhandled exception due to the comboBox1 is a control
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USAlex Walker
UserOwnerUserId
1. USAlex Walker
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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 This table or related slice is empty.
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CommentsPostId
1. COPlease encourage the OP to use parameters to avoid SQL injection. It would also solve the problem if the user name is O'Brien.
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 USLarsTech
2. COAdded relevant links and a brief description of the issue.
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 USAlex Walker

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.