Let's say I have one workbook which is having 6 sheets as Sheet1, Sheet2, Sheet3, Sheet4, Sheet5, Sheet6.
So from here I want to delete Sheet1, Sheet2, Sheet3. How can I do that?
You can call the .Delete() method, like that:
Globals.Sheet1.Delete();
Update, according your comment:
Excel._Worksheet ws = (Excel._Worksheet)app.Workbooks[i].Worksheets[j];
ws.Delete();