How to Make a Combobox Non-Editable in .Net

How can I make a ComboBox non-editable in .NET?

To make the text portion of a ComboBox non-editable, set the DropDownStyle property to "DropDownList". The ComboBox is now essentially select-only for the user. You can do this in the Visual Studio designer, or in C# like this:

stateComboBox.DropDownStyle = ComboBoxStyle.DropDownList;

Link to the documentation for the ComboBox DropDownStyle property on MSDN.

How do I set combobox read-only or user cannot write in a combo box only can select the given items?

Just change the DropDownStyle to DropDownList. Or if you want it completely read only you can set Enabled = false, or if you don't like the look of that I sometimes have two controls, one readonly textbox and one combobox and then hide the combo and show the textbox if it should be completely readonly and vice versa.

Winforms Combobox - do not allow user to edit items

Set DropDownStyle = DropDownList.

How to make Combobox in winforms readonly

The article ComboBox-with-read-only-behavior suggests an interesting solution:

Create both a readonly textbox and a combobox in the same place. When you want readonly mode, display the textbox, when you want it to be editable, display the combobox.

VB.NET: how to prevent user input in a ComboBox

Set the DropDownStyle property of the combobox to DropDownList. This will allow only items in the list to be selected and will not allow any free-form user input.

How to make Dropdownlist readonly in C#

There is no readonly property for DropDownList in asp.net

Try using:

  <asp:DropDownList ID="DropDownList1" runat="server" Enabled="False">
    </asp:DropDownList>

Or change it at runtime:

DropDownList1.Enabled=false;

and change it's css class as well.

DropDownList1.CssClass = "class";

How to disable editing of elements in combobox for c#?

Use the ComboStyle property:

comboBox.DropDownStyle = ComboBoxStyle.DropDownList;

How to use a ReadOnly like style for a Combo Box

One solution is to render the page based on the field's editability: If it is read only then create a read only textbox with the given value. If it is editable then create a normal combobox. This way only 1 value has to be rendered which may be beneficial for you as well!