PDF content read to SQL table

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C#

I have to read certain data from a PDF document and to store them in sql 2008 table.
I used itextsharp to read the complete PDFs and show in a rich text box.But the text if stored as image it will not read the content.
Now what I need to do is,

1. Suppose my PDF contains the data Rerefence ID : 123-123 .
I need to save the data 123-123 to a column in sql table.
2. How to read the content if the quality of the data is poor.
3. Is there any method to read text stored as image?
4. In some case I found $100 is read as 8100 . Is there any way to ensure the accuracy of the read text ?

Please help me.