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I want to store query result in string variable.I am using following code
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
Updated 3-Dec-12 5:39am
ryanb31 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)?
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Solution 1

1) Try this
Dim str As String = ("SELECT Item_name FROM Item_Master where Item_no='" & cmbItemName.SelectedValue.ToString() & "'")
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.
Yogi ,Pune 3-Dec-12 12:31pm
OriginalGriff 3-Dec-12 13:58pm
You're welcome!
RaisKazi 3-Dec-12 14:52pm

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