Is my SQL query naming style wrong?

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ASP.NET

I build a asp.net website, sometimes it says "Unspecified error", it happens sometimes, not always:

 string query = "SELECT TOP 1 * FROM AboutUs";
 var reade = AccessHelper.GetReader(query);      // Unspecified error occurs here
 reader.Read();
 // ..read things

DataSet data = AccessHelper.GetDataSet(narstr);
Repeater1.DataSource = data;

some people say that I use the reserved keywords like query, and reader, It seems that if I change the variable name to something else, the website will wrok properly. But I don't think this is the problem,
I didn't use the query, reader in the SQL statemtent.
I think the problem is that I forget use Close() method somewhere.

I want to know the code above whether has naming problem.