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  "Data Source=" + FilePath+ ";" + 
  "Extended Properties=Excel 8.0;"; 
using(OleDbConnection conn= new OleDbConnection(""))
{
conn.Open();
OleDbDataAdapter myCommandd = new OleDbDataAdapter("select * from [Sheet1$]", conn);
DataSet ds = new DataSet();
myCommandd.Fill(ds, "[Sheet1$]");
}

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