adding form fields to PDF using itextshap and C#

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C#

itextsharp

Hi,

I am adding form fields inside a loop with different names but I am not getting the expected value. Here is my code:

PdfReader reader = null;
PdfStamper stamper = null;
for (int i = 1 ; i <= 2; i++)
{
reader = new PdfReader(file);
stamper = new PdfStamper(reader, memoryStream);
PdfFormField acctNum = PdfFormField.CreateTextField(stamper.Writer, false, false, 50);
acctNum.SetWidget(new iTextSharp.text.Rectangle(383, 746, 521, 728), PdfAnnotation.HIGHLIGHT_INVERT);
acctNum.Flags = PdfAnnotation.FLAGS_PRINT;
acctNum.FieldName = "ACCT_NUM_" + i;
stamper.AddAnnotation(srcAcctNum, 1);
stamper.Writer.CloseStream = false;  
stamper.FormFlattening = false;
stamper.Close();
reader.Close();
}

The loop runs twice, henceforth I should get form field names as ACCT_NUM_1 and ACCT_NUM_2. But I am getting form field names as ACCT_NUM_1 and ACCT_NUM_1(2). Could you please point out the mistake I am making here.