not able to insert data into excel sheet through windows application in visual studio 2008

Error:
The Microsoft Jet database engine could not find the object 'c:\travel.xls'. Make sure the object exists and that you spell its name and the path name correctly.

following is the code am using:
Dim num As Integer
Dim MyConnection As System.Data.OleDb.OleDbConnection
Dim myCommand As New System.Data.OleDb.OleDbCommand
Dim sql As String

MyConnection = New System.Data.OleDb.OleDbConnection _
("provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + _
"'c:\\travel.xls';Extended Properties=""Excel 8.0;HDR=NO;IMEX=1""")

MyConnection.Open()
myCommand.Connection = MyConnection
sql = "Insert into [vayama$] (id,name) values('5','e')"
myCommand.CommandText = sql
num = myCommand.ExecuteNonQuery()
MyConnection.Close()