Define a Default Value when insert New Record From ASPxGridView

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:

<dx:ASPxGridView ID="ASPxGridView1" ... OnInitNewRow="ASPxGridView1_InitNewRow">...</dx:ASPxGridView>

protected void ASPxGridView1_InitNewRow(object sender, DevExpress.Web.Data.ASPxDataInitNewRowEventArgs e) {  
    e.NewValues["DataColumnForDefaultValue"] = DateTime.Now;  
}