How to store Query result in String variable

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I want to store query result in string variable.I am using following code

VB

Dim str As String = ("SELECT Item_name FROM Item_Master where Item_no='" & cmbItemName.SelectedValue & "'")

System throws an error: Operator '&' is not defined for string "SELECT * FROM Item_Master where " and type 'DataRowView'.(Invalid cast exception)

Please suggest me right query format.

Thanks in Advance

Posted 3-Dec-12 5:35am

Yogi ,Pune

Updated 3-Dec-12 5:39am

ZurdoDev

v2

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ZurdoDev 3-Dec-12 11:40am

You sure that is the error you are getting on that line? It sounds like you are trying to concatenate a string and a DataRowView together.

CPallini 3-Dec-12 12:16pm

How is declared cmbItemName (ryanb31 observation is right)?

2 solutions

Solution 2

http://social.msdn.microsoft.com/forums/en-US/Vsexpressvb/thread/3e94e187-421e-45ec-967d-2d9f2b5b7d28[^]
http://www.dreamincode.net/forums/topic/174640-storing-query-result-in-variable/[^]

Posted 3-Dec-12 6:26am

ridoy

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OriginalGriff · Accepted Answer · 2012-12-03T06:24:00

Solution 1

Either:
1) Try this

VB

Dim str As String = ("SELECT Item_name FROM Item_Master where Item_no='" & cmbItemName.SelectedValue.ToString() & "'")

Or
2) - And preferably - use parametrised queries instead. There isn't that much risk of SQL Injection from a combobox, but parametrized queries gets rid of it.

Posted 3-Dec-12 6:24am

OriginalGriff

Comments

Yogi ,Pune 3-Dec-12 12:31pm

Thanks

OriginalGriff 3-Dec-12 13:58pm

You're welcome!

RaisKazi 3-Dec-12 14:52pm

Clean!