Error while creating an XML File from existing Excel File

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C#2.0

C#

WinForms

An error message displays while executing below c# source code:

using System.Xml;
Excel = Microsoft.Office.Interop.Excel;

  System.Data.OleDb.OleDbConnection MyConnection;
            System.Data.DataSet ds;
            System.Data.OleDb.OleDbDataAdapter MyCommand;
            MyConnection = new System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='d:\\Mail_ids.xls';Extended Properties=Excel 8.0;");
            MyCommand = new System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", MyConnection);
            MyCommand.TableMappings.Add("Table", "Product2");
            ds = new System.Data.DataSet();
            MyCommand.Fill(ds);   // this line shows error
            MyConnection.Close();
            ds.WriteXml("Product2.xml");

And the error message is :

"The Microsoft Jet database engine could not find the object 'Sheet1$'. Make sure the object exists and that you spell its name and the path name correctly."

Where its confirmed that the specified Excel file exists at the said location.
What is the reason for the error and what should be the right code?