Create excel formula in C# code

I have an app that creates excel workbooks, filling with data, graphs etc no problem.

I now want to create a formula on Sheet2 that references a cell on Sheet1.

I can do it no problem with the following line of code
worksheet.get_Range(worksheet.Cells[curRowIx, curColIx], worksheet.Cells[curRowIx, curColIx]).Formula = "='SN21'!C" + startRow;

using the startRow in the formula i can loop through the rows no problem and it works. What i need is to be able to access the column in a loop also. Not using C1 but R[x]C[y] so i can loop through all data i need and populate the formulas correctly.

I know i can hardcode all the A1, B1 ... etc but that makes me nauseous and i hate repetitive code. I want to use something like

.Formula = "='SN21'" + worksheet.Cells[curRowIx, curColIx] but i cant get it to work

Thanks in advance

Winston SmithDeveloperAsked:
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FernandoFernandesConnect With a Mentor Commented:
the equivalent formula would be:
...FormulaR1C1 = "='SN21'!R3C3"

you can work with R3C3 (row 3 column 3) instead of C3 (the cell address...)
when you use absolute numbers like that, you're meaning the exact cell address.

when you use like:
...FormulaR1C1 = "='SN21'!R[3]C[-1]"
(with these square brackets) it means relative reference to the cell you're putting the formula in...
[3] is a positive number, would mean 3 rows down
[-1] is a negative number, would mean 1 column to the left

see, since the whole formula would be a string, you can treat it as you want...
Even change the 21 to 22 or whatever...
use the property FormulaR1C1 instead of Formula ...
Winston SmithDeveloperAuthor Commented:
That works great to get the value into the cell

 ws.get_Range(ws.Cells[curRowIx, curColIx], ws.Cells[curRowIx, curColIx]).FormulaR1C1 = ws2.Cells[curRowIx-1, curColIx + 1];

But it does not place a formula on the cell, which is what i need for an audit trail of where data comes from for whoever is looking at the sheet.

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you just have to write the formula in a way that excel will understrand...
what is your formula inside excel supposed to be ?
just put it here that I will translate it to you... :)
Winston SmithDeveloperAuthor Commented:

I need to increment all 3

eb - ='SN21'!C4 or ='SN22'!C4, or ='SN21'!D4 etc etc

Winston SmithDeveloperAuthor Commented:
More info, sorry. I need to be able to change worksheet name, Column and row in loops.
Winston SmithDeveloperAuthor Commented:
VERY cool! I did not know this.

One thing to ask first, when you talk about relative to the cell i am putting the formula in. If i am putting a formula in cell 1,1 on sheet2 but pulling data from cell 1,1 on sheet1 then the formula would be
FormulaR1C1 = "='Sheet2'!R[0]C[0]"?

And if it was from one row down and one column left it would be
FormulaR1C1 = "='Sheet2'!R[1]C[1]"?

Thanks for this, very quick and precise help.
Winston SmithDeveloperAuthor Commented:
Great Resource!!
positive in the bracket means row down or column to the right
negative in the bracket means row above or column to the left

you you use numbers without brackets, it's absolute reference...
if you put in cell Range("A1").FormulaR1C1= "=R5C10"
the actual formula in the cell will be =$J$5

if you put in cell Range("A1").FormulaR1C1= "=R[5]C[10]"
the actual formula in the cell will be =K6

Yeah, this is a great resource by Excel...
You're welcome... :-)
Winston SmithDeveloperAuthor Commented:
I, of course, meant you were the resource sir! haha
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