How to extract emails and client id from pdf in ASP.NET using itextsharp

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PDF

extract

I want to extract all email and respective client id from a pdf file to any control in asp.net.

how can I get this?

What I have tried:

I have tried

string urlFileName1 = "C:/Users/rtech/Desktop/Create-PDF-Images/PDF-Files/123.pdf";
       PdfReader reader = new PdfReader(urlFileName1);
       string text = string.Empty;
       for (int page = 1; page <= reader.NumberOfPages; page++)
       {
           text += PdfTextExtractor.GetTextFromPage(reader, page);
       }
       reader.Close();
       lblText.Text = text.ToString();

but it is extracting all pdf data. I want only emails and client ID
please help me out..