title: Get Column number from cell value, openxml
body: <p>I have an Excel wherein i want to get the column number for eg the below image : 
  <img src="https://i.stack.imgur.com/mL46L.gif" alt="Sample Image"></p>
  
  <p>In the above image , i know that the records will appear on the 1st row , but i am unsure of the Column number. In above example the column value : "Quantity" appears on "D1". I know the row number how can i find the column number ("D" in the above case) using OPEN XML, as the column name quantity might appear anywhere in the excel and i need to find the corresponding values of only quantity.</p>