Unable to cast object of type 'System.String' to type 'Microsoft.Office.Interop.Excel.Worksheet'.

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I have a code it returns error

Unable to cast object of type 'System.String' to type 'Microsoft.Office.Interop.Excel.Worksheet'.

what did i do wrong? I converted it but still ahve error

VB

FoundCell = xlWorkBook.Worksheets(CType(DataGridView1.Rows(i).Cells(1).Value, Microsoft.Office.Interop.Excel.Worksheet)).Range("B14:B20000").Find(WHAT_TO_FIND)

Posted 10-Sep-15 22:21pm

NekoNao

Updated 12-Sep-15 19:21pm

Wendelius

v3

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F-ES Sitecore 11-Sep-15 4:32am

It can't convert what is at

DataGridView1.Rows(i).Cells(1).Value

to a Worksheet. Given that your cell is holding a string and a Worksheet is a binary COM object, it's not surprising this cast is failing. What is DataGridView1.Rows(i).Cells(1).Value? Is it a filename? If it's a filename you'll need to use the interop objects API to load the worksheet at that location.

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Maciej Los · Accepted Answer · 2015-09-12T08:45:00

This piece of code causes error:

C#

CType(DataGridView1.Rows(i).Cells(1).Value, Microsoft.Office.Interop.Excel.Worksheet)

I'd suggest to get dataGridView cell value into string variable:

C#

string sheetname = DataGridView1.Rows(i).Cells(1).Value;

then to create object variable (of Worksheet):

C#

Microsoft.Office.Interop.Excel.Worksheet wsh = xlWorkBook.Worksheets(sheetname);

Now, you can use Find method[^]: How to: Programmatically Search for Text in Worksheet Ranges[^]

Note that Find method returns Range object!