I need to assign a value to a field in a document in lotusscrip dynamically

I have 100 fields in a form ., when i create a document . i need to assign values to those fields
but i dont want to write all 100 fields manually  because their name are like

field1
field2
field3
field4
.
.
.                       that goes like that

so i put a for loop in the for loop preceding the string "field"  appended by counter value of the for loop i get the name of the field and then try to assign value to it but i get the error

use of illegal property  below is my code. how can i achieve this?

      For x=0 To datacount  
            
                  doc.KHedef&Cstr(x+1)="value1"                                                             doc.Ilgilihoshin&Cstr(x+1)="value2"
                  doc.HedefBitis&Cstr(x+1)="value3"
                  doc.BasariOlcum&Cstr(x+1)="value4"
                   doc.Agirlik&Cstr(x+1)="value5"

                  
                        

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