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Editorial Team
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Asked: 2026-05-13T06:14:23+00:00

I’ve got a DataSet in VisualStudio 2005. I need to change the datatype of

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I’ve got a DataSet in VisualStudio 2005. I need to change the datatype of a column in one of the datatables from System.Int32 to System.Decimal. When I try to change the datatype in the DataSet Designer I receive the following error:

Property value is not valid. Cannot change DataType of a column once
it has data.

From my understanding, this should be changing the datatype in the schema for the DataSet. I don’t see how there can be any data to cause this error.

Does any one have any ideas?

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1 Answer

  1. Editorial Team

    I get the same error but only for columns with its DefaultValue set to any value (except the default <DBNull>). So the way I got around this issue was:

    1. Column DefaultValue : Type in <DBNull>
    2. Save and reopen the dataset
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