C of 4.0 unusual syntax

: specify parameters

 
public DataTable TodayToTable(int userId) 
{ 
return userId > 0 ? V_CN_TASK_VALID_SCORING_TODAY.QueryTable(condition: " WHERE  subcontractors Id = " + userId) : null; 
} 

Where condition: "WHERE Id =" + userId specifies that condition is an QueryTable method parameter

 
/// <summary> 
///  Queries the records for the specified table  
/// </summary> 
/// <param name="table"> The name of the table </param> 
/// <param name="fields">SELECT  List of field names for the clause </param> 
/// <param name="condition"> Query conditions </param> 
/// <param name="args"> A list of command parameter names separated by half - Angle commas </param> 
/// <param name="vals"> Array of command argument values ( optional )</param> 
/// <returns> The query results </returns> 
public static DataTable QueryTable(this string table, string fields = null, int? limit = null, string condition = null, string args = null, params object[] vals) 
{ 
return GetTable(table.QueryDataSet(fields, limit, condition, args, vals), 0); 
} 

?? The operator

 
var m_queryFields = fields.TrimNull() ?? "*"; 

Is equal to the

 
var m_queryFields = fields.TrimNull() ? "*" : fields.TrimNull();