Thanks for contacting Syncfusion Support.
We have analyzed your query (“How to set the IncrementStep to decimal value like IncrementStep="0, 25" ”). In our NumericTextbox control IncrementStep property was defined as number, so it doesn’t allow the string value based on the culture format.
You can use the IncrementStep property as integer, please refer the below code snippet.
<ej:NumericTextBox ID="note1" Value="0" runat="server"
IncrementStep="0.25" DecimalPlaces="2" Locale="fr-FR" />
To know more details about incrementStep property, please refer the below document.
We have prepared a sample based on your requirement (“How to set the IncrementStep to decimal value like IncrementStep="0, 25"”) with NumericTextbox control. The sample can be downloaded from the following location.
Please let us know if you have further queries.