https://community.esri.com/t5/geoprocessing-questions/vb-net-geoprocessor/m-p/1052323#M25504 <P>Try this way</P><LI-CODE lang="markup">"[" &amp; field1 &amp; ", " &amp; field2 &amp; "]" </LI-CODE><P>When I build code for Geoprocessing tools, I would also check the documentation to see how it's constructed in python, then mimic that behavior.</P><P>For the Frequency tool, it's looking for this syntax</P><LI-CODE lang="python">arcpy.Frequency_analysis("taxlots", "C:/output/output.gdb/tax_frequency", ["YEARBUILT", "COUNTY"], ["LANDVAL", "BLDGVAL", "TOTALVAL"])</LI-CODE> Wed, 28 Apr 2021 15:33:55 GMT KenBuja 2021-04-28T15:33:55Z https://community.esri.com/t5/geoprocessing-questions/vb-net-geoprocessor/m-p/1052298#M25503 <P>How do you format the frequency fields when using&nbsp;ESRI.ArcGIS.AnalysisTools.Frequency with a gp.Execute?</P> Wed, 28 Apr 2021 14:57:58 GMT https://community.esri.com/t5/geoprocessing-questions/vb-net-geoprocessor/m-p/1052298#M25503 MichaelStranovsky 2021-04-28T14:57:58Z https://community.esri.com/t5/geoprocessing-questions/vb-net-geoprocessor/m-p/1052323#M25504 <P>Try this way</P><LI-CODE lang="markup">"[" &amp; field1 &amp; ", " &amp; field2 &amp; "]" </LI-CODE><P>When I build code for Geoprocessing tools, I would also check the documentation to see how it's constructed in python, then mimic that behavior.</P><P>For the Frequency tool, it's looking for this syntax</P><LI-CODE lang="python">arcpy.Frequency_analysis("taxlots", "C:/output/output.gdb/tax_frequency", ["YEARBUILT", "COUNTY"], ["LANDVAL", "BLDGVAL", "TOTALVAL"])</LI-CODE> Wed, 28 Apr 2021 15:33:55 GMT https://community.esri.com/t5/geoprocessing-questions/vb-net-geoprocessor/m-p/1052323#M25504 KenBuja 2021-04-28T15:33:55Z