How to add a validator to a user control in Dot-net

Question

You have developed a page named TestPage.aspx and a user control named TestUserControl.ascx. The page includes the user control as follows:

```html
<uc:TestUserControl ID="testControl" runat="server"/>
```

You need to add a read-only property named "CityName" that should return the value "New-York". You also need to read this value in the web page's code.

What steps should be taken to achieve this?

Accepted Answer

Add the following line of code to the user control code:

```csharp
public string CityName
{
    get { return "New York"; }
}
```

Accepted Answer

Add the following line of code to the web page:
```csharp
protected void Page_Load(object sender, EventArgs e)
{
    string s = testControl.CityName;
}
```

Answer

Add the following line of code to the user control code:
```csharp
protected readonly string CityName = "New York";
```

Answer

Add the following line of code to the web page:
```csharp
protected void Page_Load(object sender, EventArgs e)
{
    string s = testControl.Attributes["CityName"];
}
```

Question from the ASP .NET test

How to add a validator to a user control in Dot-net