Read Excel file from c#

DataSet ds = new DataSet();
OleDbConnection conn;
OleDbCommand cmd = new OleDbCommand();
OleDbDataAdapter adapter;
conn = new OleDbConnection("Provider=Microsoft.Jet.OleDb.4.0;" +
"Data Source= e:\\claimtable1.xls;" +
"Extended Properties=Excel 8.0");
conn.Open();
var zz = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
DataTable dtSheet = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
cmd.Connection = conn;

foreach (DataRow dr in dtSheet.Rows)
{
    string sheetName = dr["TABLE_NAME"].ToString();
    if (!sheetName.EndsWith("$"))
        continue;
    cmd.CommandText = "SELECT * FROM [" + sheetName + "]";
    DataTable dt = new DataTable();
    dt.TableName = sheetName;
    OleDbDataAdapter da = new OleDbDataAdapter(cmd);
    da.Fill(dt);
    ds.Tables.Add(dt);

    string Number = dt.Columns[1].ToString();
}
cmd = null;
conn.Close();