C#/WPF: Defining an EXCEL range through row and column number -


i have tried this

how excel range using row , column numbers in vsto / c#?

but throw undefined com exception

what (pseudocode)

range myrange = new range(new cell(1,1), cell(3,3));

so can use (pseudocode again)

ws.myrange.interior.color = xlrgbcolor.rgbdarkgray;

thank you

please check out: 

range range1 = ws.range[ws.cells[1, j], ws.cells[1, j+1]];

here, range : 

microsoft.office.interop.excel.range

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