I bound the ItemSource to RadAutoCompleteBox and the data is bound to the RadAutoCompleteBox. But I am struggling with validating the RadAutoCompleteBox.
If any invalid data (other than the ItemSource) is entered, it takes the selectedItem as null.
If I don't enter any value into the box, it also takes the selectedItem as null. I want to differentiate between them.
Any Help is appreciated.
You can use the RadAutoCompleteBox SearchText property. The SearchText does not return the AutoCompleteBox items, instead it returns the plain text you are entering in the AutoCompleteBox.
Related
I am now using a plain DataGridView component to display data with my own implementation of IBindingSource interface. The columns are binded to properties.
Now I am trying to compare the current "display value" in the grid (i.e. the actual previous value) and the latest value in the IBindingSource to determine background of the cell. Is it correct to compare the Value on the event with the value like Grid.Rows[rowIndex].Cells[columnIndex] ? Or is there any other way to do this?
Thanks in advance.
I am using a linq to sql for populating a combo box. to populate combobox i am using the following code on page load event:
ColdStoreDataContext csdc = new ColdStoreDataContext();
comboBox1.DisplayMember="Name";
comboBox1.ValueMember="AccountHeadId";
comboBox1.DataSourse=csdc.SupplierPurchase;
the above code is working properly but when I use the given code:
comboBox.SelectedValue="KAMAL SINGH S/O AJEET SINGH";
then it does not properly works means comboBox displayed null value.
Please help me to resolve this problem.
Your combo box has AccountHeadId as its ValueMember. When you set the combo box's SelectedValue, the box will look in its data source for an item whose AccountHeadId matches the value you just set to SelectedValue.
Try
comboBox1.SelectedValue=2;
Is there any property to remove the first (and empty) item in a combobox with style DropDownList ? In other words, I would like to choose the default selected item for a combobox.
I know i can validate the selected item with code, but i want to avoid showing message boxes to the user.
Set the comboBox.SelectedIndex property to 0 to set the selection to the first item in the combobox.
You should set the Text or SelectedIndex or SelectedValue property. In this way the combobox updates the text that's is showing and removes the first empty item (that actually is not a real item).
I have combobox with items binded to viewmodel. In viewmodel there is List for them with following values: "+","-", null.
I bind selected value to another string property two-way. Problem is, that when i choose my null item in combobox, corresponding property gets "System.Windows.Controls.ComboBoxItem" value Oo. If i choose + or - everything's fine. What kind of workarounds can you suggest? I'd rather have a null value inside combobox than use converter though.
I would like my comboboxes to have the first value be empty so that the user can clear their previous selection. The comboboxes are bound to entities in the ViewModel. So how do I add this first value. I could used combobox.inert(0, new Entity), but is that the correct way?
This is for searching purposes: By default the combobox has no selection and the search will find everything. If they select an item the search is filtered.
As your ViewModel is responsible for preparing the data to be displayed by the View, the ViewModel should add the empty element at the beginning of the collection that is then bound to the combobox.