Devexpress – Bits of .NET

How to create the ShowBlanksValue and ShowNonBlanksValue items in Devex Grid

By design, GridViewDataComboBoxColumn does not render (Blank) and (NonBlank) items if the HeaderFilterMode property is set to CheckedList. However, you can add these items in the HeaderFilterFillItems event handler. Just call the FilterValue.CreateShowBlanksValue and FilterValue.CreateShowNonBlanksValue methods. <dx:ASPxGridView ID=”grid” runat=”server” AutoGenerateColumns=”False” DataSourceID=”dsCategories” KeyFieldName=”CategoryID” OnHeaderFilterFillItems=”grid_HeaderFilterFillItems”> <Columns> <dx:GridViewDataTextColumn FieldName=”CategoryID”> </dx:GridViewDataTextColumn> <dx:GridViewDataTextColumn FieldName=”Description”> </dx:GridViewDataTextColumn> <dx:GridViewDataComboBoxColumn FieldName=”CategoryNameNull” Caption=”Category Name”> <Settings HeaderFilterMode=”CheckedList” /> <PropertiesComboBox DataSourceID=”dsCategories” ValueField=”CategoryNameNull” TextField=”CategoryNameNull” /> </dx:GridViewDataComboBoxColumn> </Columns> […]

C# / Devexpress

Add default value to Devex Grid Columns in C#

- 06.01.22 - ErcanOPAK comment

protected void grid_InitNewRow(object sender, DevExpress.Web.Data.ASPxDataInitNewRowEventArgs e) { e.NewValues[“BirthDate”] = new DateTime(1970, 1, 10); e.NewValues[“Title”] = “Sales Representative”; } Here is the result:

ASP.Net MVC / Devexpress

How to apply a custom CSS class to Devexpress components

- 30.03.20 - ErcanOPAK comment

For all the Devex Components, you can use ControlStyle > CssClass property to apply your custom CSS class (Example 1 and 2) or you can do it with parameter (if it is allowed – as in Example 3). Here is 3 examples for MVC: @Html.DevExpress().SpinEditFor(m => m.Books.Rating, settings => { settings.Properties.SpinButtons.ShowIncrementButtons = true; settings.Properties.Increment = […]

ASP.Net MVC / ASP.Net WebForms / C# / Devexpress

Define a Default Value when insert New Record From ASPxGridView

- 29.03.20 | 29.03.20 - ErcanOPAK comment

To initialize DataRow’s default values handle InitNewRow event of the required ASPxGridView control and initialize the default values by using e.NewValues dictionary in the following manner:

ASP.Net WebForms / C# / Devexpress

ASPxGridView – Disable CheckBox based on condition in GridViewCommandColumn

- 20.11.19 | 27.11.19 - ErcanOPAK comment

You can use code below:

ASP.Net MVC / ASP.Net WebForms / Devexpress / HTML

How to Solve The ‘Object reference not set to an instance of an object’ error in Batch Edit mode for ASPxGridView

- 01.10.19 | 22.11.19 - ErcanOPAK comment

The issue occurs in Batch Edit Mode, because in this mode an empty invisible row is created and used for further grid editing. Since the Eval method returns a value type of an object, your attempt to call the ToString() method to the null value can lead to an exception. If you remove this conversion and use <%# […]

ASP.Net WebForms / Devexpress