C#.NET - Getting index of table by column name

foreach (DataRow drRow in dtTable.Rows)

{

   int index = drRow.Table.Columns["ColumnName"].Ordinal;

}

foreach (DataColumn dc in dtReport.Columns)

{

  int index = dc.Ordinal;

}

foreach (DataRow drTempRow in dtReport.Rows)

{

                           

 int rowIndex = dtReport.Rows.IndexOf(drTempRow);

 if (rowIndex > 1)

 {

  object sumObject;

  sumObject = dtReport.Compute("Sum(Total)", "EmpID = 5");

 }

}