C# code with a SQL string is converting single quotes to 2 single quotes.

I have a bit of code as below, and for some strange reason the actual code issued to SQL server has all of the single quotes replaced with 2x single quotes. Not by my code though. Any thoughts anyone ?
C# code
string sql = @"SELECT TOP 1 isnull(rtrim(JCI.joco_FirstName), '''' ) WHERE Case_CaseId = @CaseId;";
     // execute
     using (SqlDataAdapter da = new SqlDataAdapter(sql.ToString(), connection))
     {
         da.SelectCommand.Parameters.AddWithValue("@CaseId", JobId);
         da.Fill(dtDetail);
     }


Actual SQL issued (via SQL Profiler trace)
exec sp_executesql N'SELECT TOP 1 isnull(rtrim(JCI.joco_FirstName), '''''''' ) WHERE Case_CaseId = @CaseId;',N'@CaseId int',@CaseId=2237361

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Phil CatterallAsked:
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Carl TawnSystems and Integration DeveloperCommented:
SQL Server is escaping them because the parameter to sp_executesql is itself wrapped in single quotes. You don't need to double up the quotes in your query, the following should work fine:
string sql = @"SELECT TOP 1 isnull(rtrim(JCI.joco_FirstName), '' ) WHERE Case_CaseId = @CaseId;";

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Phil CatterallAuthor Commented:
Perfect. Simples !!
Thanks
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