Add radio button list items programmatically in asp.net

Question

I have a radio button list whose items I need to add on `Page_Load` aspx code ``` ``` code behind ``` protected void Page_Load(object sender, EventArgs e) { RadioButtonList radioList = (RadioButtonList)Page.FindControl("radio1"); radioList.Items.Add(new ListItem("Apple", "1")); } ``` After the control reaches `radioList.Items.Add` I keep getting the `Object reference not set to instance of an object` error What am I doing wrong?

Accepted Answer

You don't need to to do a FindCOntrol. As you used the runat="server" attributes, just get the reference of your RadioList via its name "radio1"

```
protected void Page_Load(object sender, EventArgs e)
{
    radio1.Items.Add(new ListItem("Apple", "1"));
}
```

Add radio button list items programmatically in asp.net

Solution

Problem