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Right, that version Easy Calculate 5.0 is not compatible with ArcGIS 10.0 - see this:
"EasyCalculate 5.0 was for a long time a very popular set of expressions for the Field Calculator. The expressions however were written in Visual Basic for Applications (VBA) which is not supported in ArcGIS 10."
http://www.ian-ko.com/free/EC10/EC10_intro.htm
Try this upgrade, although your function may not be in there:
EasyCalculate 10
http://www.ian-ko.com/free/EC10/EC10_main.htm
Notice the minimum requirements at the bottom of the page:
ArcGIS 10.0
Microsoft Visual Studio 2008 Express edition, Microsoft Visual Studio full 2008 or 2010
ArcGIS SDK for the Microsoft .NET Framework
EDIT: By the way, you already have ArcGIS 10 and can install the free ArcGIS .NET SDK, and if you didn't know, you can get the Express version of Visual Studio free as well:
Microsoft Visual Studio 2008 Express Edition
http://www.microsoft.com/en-us/download/details.aspx?id=6506
Right, that version Easy Calculate 5.0 is not compatible with ArcGIS 10.0 - see this:
"EasyCalculate 5.0 was for a long time a very popular set of expressions for the Field Calculator. The expressions however were written in Visual Basic for Applications (VBA) which is not supported in ArcGIS 10."
http://www.ian-ko.com/free/EC10/EC10_intro.htm
Try this upgrade, although your function may not be in there:
EasyCalculate 10
http://www.ian-ko.com/free/EC10/EC10_main.htm
Notice the minimum requirements at the bottom of the page:
ArcGIS 10.0
Microsoft Visual Studio 2008 Express edition, Microsoft Visual Studio full 2008 or 2010
ArcGIS SDK for the Microsoft .NET Framework
EDIT: By the way, you already have ArcGIS 10 and can install the free ArcGIS .NET SDK, and if you didn't know, you can get the Express version of Visual Studio free as well:
Microsoft Visual Studio 2008 Express Edition
http://www.microsoft.com/en-us/download/details.aspx?id=6506