Try this...

// Create a primary key...analagous to index on <col1 + col2>...except that the combination MUST be unique
MyTable.PrimaryKey =new DataColumn[] {MyTable.Columns["Key"], 
                                   MyTable.Columns["Module"]};

// do a find, return a single datarow if successful
DataRow DrLookup = MyTable.Rows.Find(lcKey + lcModule);
if(DrLookup!=null) {
   switch(tLanguage) {
         case 1:
             lcString = DrLookup["French"];
             break;
         case 2:
             lcString = DrLookup["English"];
             break;
         }
}

I realize that's in C#...I think for the most part if you replace the [] with (), that should either work or be very close.

Let me know if that helps...
Kevin