The procedure below combines the information from all the sheets in all open workbooks into a single worksheet in a new workbook that is created. Combining all Sheets from all Open Workbooks to a single Worksheet in a New Workbook.The result is that, if the pivot element is in row r, then the column becomes the r -th column of the identity matrix. The row containing this element is multiplied by its reciprocal to change this element to 1, and then multiples of the row are added to the other rows to change the other entries in the column to 0.In the previous section we saw how to import Microsoft Excel 12.0 Object Library in the VB.Net project. The following VB.Net source code using Microsoft Excel 12.0 Object Library for reading an Excel file. Also this program explains how to Find the last used row in Excel and how to find Named Ranges in Excel.

I am trying to loop until the last non-empty row and check A, B, C columns for matching data and then give out the corresponding 4th column as output.