Tesseract ocr Text not getting value from variable

I am trying to get value using ocr text value is stored in InvoiceNum,Main.xaml (24.1 KB) but when i printing i am getting this System.Collections.Generic.List1[System.Collections.Generic.KeyValuePair2[System.Drawing.Rectangle,System.String]]

give me solution
I am using this pdf as a input : ascend akshayam business.pdf (225.1 KB)