Metoden Update i ObjectDataSource X måste ha en parameter som passar OldValuesParameterFormatString. Kontrollera UpdateMethod eller ändra ConflictDetection till OverwriteValues.
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English version
The Update method on ObjectDataSource 'X' must have a parameter that fits the OldValuesParameterFormatString. Check your UpdateMethod or change your ConflictDetection to OverwriteValues.