We Keep Coding

C# how to sum the data from datagridview

how to sum the data from datagridview not only for one value but foreach data(1000 numbers) from one specific column with the same number and show the result in other datagridview column( thx for help!)
For example I use the excel table to read the Data

Start by using a variable to which you assign 0. For each row of the DataGridView, get the value at the desired column and sum it up. Then use that value to populate the desired cell.

Auto-fit all columns and find the last row and the last column that have data

I'd like to:
Make sure all the columns of an Excel worksheet are widened enough to fit the text in each row of the column; and
I'd like to find the last column and the last row that have data in that worksheet, i.e. the last non-empty row and the last non-empty column.
A cell that has a background color but no text would also be considered to be non-empty.
So, for instance, a worksheet like this:
Looks like this:
And the last data cell is reported as D10 because it is the last dirty cell even though it has no text.
What VSTO methods/API will give me the above?

For determining a used range use Worksheet.UsedRange Property:
https://msdn.microsoft.com/en-us/vba/excel-vba/articles/worksheet-usedrange-property-excel?f=255&MSPPError=-2147217396
For autofit columns in this range use Range.AutoFit Method:
https://msdn.microsoft.com/en-us/vba/excel-vba/articles/range-autofit-method-excel?f=255&MSPPError=-2147217396
UsedRange = ActiveWorkbook.Worksheets.Item("Sheet1").usedrange
UsedRange.Columns.Autofit

How to find and use specific cell

I have an excel file with a column of names and a column of numbers.
I had imported the excel into the Datagrid and manage to find the maximum number among from the column.
For example, the cell which is the maximum is at (x,y).
How do I get the program to know the cell and display the name in the same row?

Change value in 2nd row if PDFPTable of iTextSharp in C#

I have generated PDF file using "iTextSharp" API properly.
Now i want to add total quantity in second row, how i can change value in second row after writing last row of table.
Any ideas.
I have created one table with suppose 3 columns.
Then added 3 rows in table.
After third i want to change value in first row, is it possible ?
How can i do this in C# ?
Thanks.

Split Datatable with large column into Child Datatables columnwise with one column fixed

I have large datatable with atleast 50 columns.
first column contains the description of row data
i.e In 1st column, row data is the header for the rows so
i want to keep the 1st column
Large Datatable must be split into child datatable after every 10 columns maintaining the first column values
1st column of parent layout must retain in all child datatables
. Please suggest best possible solution. Thanks.