Error: No overload for method 'Compute' takes '1' arguments

I am getting this error trying to sum a column. The column was
originally imported as text. I am attempting to convert it and then sum
it. I get this error on the compute method.  I need a way to do this if
there is an easy or better method please help.
 
//Create a string to represent our SQL query
                  string  SelectCommand6 ="select How_Many_Media from
Pilots Where App_Recd = 'Y' and How_Many_Media = 'Y'";
 
                  //Create our SqlDataAdapter - required to fill a
DataSet
                  SqlDataAdapter myDataAdapter6 = new
SqlDataAdapter(SelectCommand6, myConnection);
 
                  //Fill the DataSet and name the newly created
DataTable "Pilots"
                  myDataAdapter6.Fill(myDataSet6, "Pilots");
 
                  DataTable myTable;
                  myTable = myDataSet6.Tables["Pilots"];
                  // Declare an object variable.
 
                  TotalHowManyMedia =
myTable.Compute("Sum(Convert.ToInt32('How_Many_Media'))").ToString();
 
Get this error on this line: Error: No overload for method 'Compute'
takes '1' arguments
 
 
 


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