crystal report recordnumber

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C#

.NET

Sir I have taken the Special Field Record number (Sr No) in the Crystal report to display the records with serial number.As my report shows the duplicate employee names if condition becomes true. So I wanted if Employee name duplicates then their record number (Sr No) should not increment. But should increment when new employee name is their.
i.e at present my report

Sr  Name
 1  abcd
 2  xyz
 3  xyz
 4  xyz
 5  pqr
 6  efgh

but I want Crystal report to display as-

Sr  Name
1  abcd
2  xyz
*  xyz
*  xyz
3  pqr
4  efgh

Any Solution
Thanking You