How To Add Column In Database At Runtime.

Hello all,

I m trying to add a column in my database (it is a csv file)
but it is giving me following exception.
------exception------------
{System.Data.OleDb.OleDbException}
ErrorCode: -2147467259
Errors: {System.Data.OleDb.OleDbErrorCollection}
HelpLink: Nothing
InnerException: Nothing
Message: "Operation not supported on a table that contains data."
Source: "Microsoft JET Database Engine"
StackTrace: " at
System.Data.OleDb.OleDbCommand.ExecuteCommandTextE rrorHandling(Int32 hr)
at
System.Data.OleDb.OleDbCommand.ExecuteCommandTextF orSingleResult(tagDBPARAMS
dbParams, Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommandText( Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommand(Comm andBehavior behavior,
Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteReaderIntern al(CommandBehavior
behavior, String method)
at System.Data.OleDb.OleDbCommand.ExecuteNonQuery()

Here is my code for this.
--------Code--------------
Dim ConnectString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data
Source=c:;Extended Properties=""text;HDR=Yes;FMT=Delimited"""
Dim myCon As New OleDbConnection(ConnectString)

Try

myCon.Open()
'Debug.WriteLine("Connection Opened")

Dim cmd As New OleDbCommand

cmd.CommandText = "ALTER TABLE [sample.csv] ADD mycol VARCHAR(50) NULL"
cmd.Connection = myCon
cmd.ExecuteNonQuery()

Catch ex As OleDbException
debug.WriteLine(ex.Message)
Finally
myCon.Close()
End Try

Any known reasons and workarounds????
Thanks & Regards.