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Escaping a single quote in DataTable select expresssion
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Sir Phillip Sydney (VIP)
I am adding data to a DateTable in a DataSet and need to verify if a row
already exists with a specific column value:

string aName = "O'Connor";
string filter = "Name='" + aName + "'";
DataRow [] drs = MyDataset.MyTable.Select(filter);
if( drs.Length == 0 ) {
// Add a row for this name
}

Note the name (O'Connor) contains a single quote.

How should I escape the aName value so the filter works?

Disclaimers:
1. This is a select on a DataTable not a database select -- so no
parameterized queries.
2. The table MyDataset.MyTable already has a primary key on another field,
so I can't do a MyTable.FindByXXX
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Val Mazur
Hi,

You need to double it and it should work

--
Val Mazur
Microsoft MVP

"Sir Phillip Sydney" <Click here to reveal e-mail address> wrote in
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Sir Phillip Sydney (VIP)
Indeed it does. Thank you sir!

Strange this isn't mentioned in the DataColumn.Expression Property
documentation (at least, if it is, I can't find it) -- seems like pretty
fundamental information. All the information about escaping seems to relate
to how to escape wierd column names.

Any doc-person at Microsoft listening?

"Val Mazur" wrote:

[Original message clipped]
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Val Mazur
It is just some sort of standard. It was exact same way in ADO and it works
exact same way in a SQL statements. This is probably why Microsoft does not
mention it in documentation

--
Val Mazur
Microsoft MVP

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System.Data.DataColumn
System.Data.DataRow
System.Data.DataSet
System.Data.DataTable




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