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Thank you very much for your reply. Find my comments to your points (and questions) below:
2) Comments on breaking changes:
Now let us focus on the change I mentioned: DoubleTextBox in version <= 8.1 (2010) has property IsNullValue which is not available in later versions starting at 9 (2011).
3) No online documentation available. After I failed to find documentation of the mentioned breaking change, I tried to Google it.
I think I am doing something wrong, but on the other hand, it should be possible to list all breaking changes from version to version on one page and not being able to find anything after spending 1 hour (or even more).
We hope you are searching for the documentation of our DoubleTextBox, Please refer the below documentation link for further reference.
o Query : When I go to http://help.syncfusion.com/cr/windowsforms/tools and enter DoubleTextBox into the search box, I get many results, but mostly referencing WPF or user documentation with nice pictures, but no class reference...
You can search our windows forms product by entering the control name and our product name “DoubleTextBox Windows Forms”, so that it will display our WinForms product with high priority.
Please let us know if you need further details on this.
this.doubleTextBox1.AllowNull = true;