Persist Change in RadDropDownListEditor with empty string.

Hello, Shubham,

According to the provided information, I suppose that you are using a GridViewComboBoxColumn. Please have in mind that this column type accepts only valid values according to the applied GridViewComboBoxColumn.DataSource collection. If the editor's value is not present in the column's DataSource, it is not expected to be preserved when exiting the cell's edit mode. 

I have tested setting the column's DropDownStyle property to DropDown which enables editing in the editor. If the test is cleared, the empty value is stored: 

        public RadForm1()
        {
            InitializeComponent();
            GridViewComboBoxColumn comboCol = new GridViewComboBoxColumn("Combo");
            comboCol.DataSource = new List<string>() { "one", "two", "three" };
            comboCol.ValueMember = "SupplierID"; 
            comboCol.Width = 200;
            comboCol.DropDownStyle = RadDropDownStyle.DropDown;
            this.radGridView1.Columns.Add(comboCol);
        }

If the above solution doesn't work for your scenario, there are two general approaches that can be followed in this case: 

1. Add the specific values (e.g. empty string, or "-") to the GridViewComboBoxColumn.DataSource collection so they will be valid. Thus, the GridViewComboBoxColumn.DataSource collection will contain all the entered empty value.

2. Use a GridViewTextBoxColumn. Since the default editor for the GridViewTextBoxColumn is RadTextBoxEditor, it is necessary to be replaced with a RadDropDownListEditor in the EditorRequired event. It is necessary to specify the editor's DataSource, DisplayMember and ValueMember properties in a similar way like you do it for the GridViewComboBoxColumn. A sample code snippet for this approach is available in the second section of the following KB article:

https://docs.telerik.com/devtools/winforms/knowledge-base/display-text-for-invalid-values-in-grid-combobox-column 

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik