How do I replace a worksheet in an excel workbook with another worksheet having same name

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I'm working on an application which requires me to create an excel worksheet in an existing workbook if the worksheet name doesn't exist and to replace it if it already exists.
I've tried using the code below but I get an error which says "Object reference not set to instance of an object". Please any ideas what is going wrong ?
This is the code.

C#

foreach (Worksheet wsheet in entire_workbook.Worksheets)
if (wsheet.Name.Equals(sheet_name))
{
    Excel.DisplayAlerts = false;
    wsheet.Delete();
    entire_workbook.Save();
    Excel.DisplayAlerts = true;
    break;
}
weekly_worksheet = (Worksheet)weekly_workbook.Sheets[1];
//entire_worksheet = (Worksheet)entire_workbook.Worksheets.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value);
weekly_worksheet.Copy(entire_worksheet, Missing.Value); //error occurs here
entire_workbook.Save();
weekly_workbook.Save();
entire_workbook.Close(false, Type.Missing, Type.Missing);

Posted 13-Mar-14 23:58pm

Emejulu JVT

Updated 14-Mar-14 1:09am

v3

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Richard MacCutchan 14-Mar-14 6:50am

Which line throws the exception?

Emejulu JVT 14-Mar-14 7:11am

weekly_worksheet.Copy(entire_worksheet, Missing.Value); //error occurs here

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Maciej Los · Answer 1 · 2014-03-15T04:57:00

Solution 1

Looping through the collection of worksheets in inefficient. Rather use something similar to this:

C#

try
{
Worksheet wsh = YourWorkbook.Worksheets["WorksheetName"];
wsh.Delete();
}
catch (...)
{
   //do not inform about errors ;)
}
//now you can add worksheet with the same name ;)

Note: Not tested!

Posted 15-Mar-14 4:57am

Maciej Los

Updated 15-Mar-14 4:59am

v2