How to convert query entity condition into to lower or to upper?

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4

currentRow[“Primary RM …”].ToString().ToLower(); // Convert to lowercase
currentRow[“Primary RM …”].ToString().ToUpper(); // Convert to Uppercase

OR ignore case differences
loop the datatable
if (string.Equals(entity.EmailAddress, currentRow[“Primary RM …”].ToString(), StringComparison.OrdinalIgnoreCase))
{
// Emails match
}