C# (CSharp) Microsoft.Microsoft.Office.Core.Tools.Microsoft.Office.Interop.Excel.Worksheet.Activate - 10 examples found. These are the top rated real world C# (CSharp) examples of Microsoft.Microsoft.Office.Core.Tools.Microsoft.Office.Interop.Excel.Worksheet.Activate extracted from open source projects. You can rate examples to help us improve the quality of examples.