Error - Failure creating file

Hi

I get above error on line. - ExcelConnection.Open();

string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;
                            Data Source=C:\Customer.XLS;
                            Extended Properties=Excel 8.0";
 
System.Data.OleDb.OleDbConnection ExcelConnection = new System.Data.OleDb.OleDbConnection(ConnectionString);
 
string ExcelQuery;
ExcelQuery = "Select * from [Sheet1$]"; // from Sheet1";
 
System.Data.OleDb.OleDbCommand ExcelCommand = new System.Data.OleDb.OleDbCommand(ExcelQuery, ExcelConnection);
 
ExcelConnection.Open();

Thanks