Error to convert the column name

Help Studio
, ,
1

I have used the activity the function below to convert the excel index into a letter

Convert.ToChar (65 + ContColumn) .ToString ()

It worked well until the letter Z, now that the robot needs to add the column “AA”, the error appears that “[1: [200” and not convert the index in letter.

2

have a look on this activity. it will do it for you:
grafik