Insertion in CSV file using oledb failed

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C#

ASP.NET

MS-Excel

OleDb

I am trying to insert data in MS Excel file to a specific rown and specific cell

But I am getting error in sql syntax.
Below is my C# Code

OleDbCommand ocmd2 = new OleDbCommand("insert into [" + fileUpload.FileName + "] ([LATTITUDE], [LONGTITUDE]) values ('abc', '123') where [CLIENTS_ID]=42;", oconn);
ocmd2.ExecuteNonQuery();

[CLIENTS_ID] is the column name having IDs of data.
[LATTITUDE] and [LONGTITUDE] are the colums where I am entering the data.

I have tried both

[CLIENTS_ID]=42

and

[CLIENTS_ID]='42'

but I get
"Missing ; at the end of Sql Command"

Please help