SqlDataSource.FilteExpression "!=" does not work?

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Hi,

I have a SQlDataSource that binds to a GridView. I am using a
parameterized FilterExpression to filter the results.

If i use MyField = '{0}' it works fine. But i need to do MyField !=
'{0}'. This breaks with an error: 'Cannot interpret token '!' at
position 16.'

What syntax results in a working equivalent of this statement?

Many Thanks

.