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This is the way I do it, might be helpful.

pawn Код:

format(diagstr, sizeof(diagstr), "ID\tDuel Name\n");
                    for(new x=0; x<MAX_DUELS; x++)
                    {
                        format(dFile, sizeof(dFile), DUELFILES, x);
                        if(strlen(dini_Get(dFile, "duelName")) > 0) format(diagstr, sizeof(diagstr), "%s%d\t%s\n", diagstr, x, dini_Get(dFile, "duelName"));
                        else format(diagstr, sizeof(diagstr), "%s%d\tEmpty Slot\n", diagstr, x);
                    }
                    ShowPlayerDialog(playerid, DUELDIAG+2, DIALOG_STYLE_LIST, "Duel List", diagstr, "Select", "Exit");

It formats the string until the loop is over, then it shows the resulting string.