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no overload for method 'this' takes '1' arguments

As @Calvin indicated there are multiple issues with the code. Here is a working solution:

string file = "Test.xls";
Application excel = new Application();
Workbook workbook = excel.Workbooks.Add();
Worksheet sheet = (Worksheet) workbook.Worksheets.Add();
sheet.Name = "First Sheet";
for (int i = 1; i <= 100; i++)
    ((Range)sheet.Cells[i, 1]).Value = "";
workbook.SaveAs(file);




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