You can try to enhance the filtering by e.g. Trimming / Harmonizations
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dtFiltered =
(From d in dtData.AsEnumerable
Where d("Client Name").toString.Trim.Equals(searchNameVar)
Select r =d).CopyToDataTable
Handling empty filter results we can do:
[FirstAid] Handling of The source contains no DataRows exception - News / Tutorials - UiPath Community Forum
can you tell / show more?