ExecuteScalar missing Assembly Reference

I posted a question about how to save the result of an SQL command to a variable and was told that the execute scalar method should be used, however I can't use it, I开发者_开发问答'm using the System.Data.SQLClient reference but still not finding it :S

Any ideas???

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Are you really doing:

using System.Data.SqlClient;
....
var command = new SqlCommand();
command.ExecuteScalar();

If so. What framework version of .NET are you using?

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SqlClient has a lowercase ql.