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copied!<p>I'm not sure the purpose of Recipient class. Anyhow, you want to instantiate Recipient list before adding a recipient.</p> <p><img src="https://i.stack.imgur.com/Ilk2Q.jpg" alt="enter image description here"></p> <pre><code><asp:TextBox runat="server" ID="txtFName" /><br /> <asp:Button runat="server" ID="btnEnter" Text="Submit" OnClick="btnEnter_Click" /><br /> <asp:Label runat="server" ID="lblFName" /><br /> <asp:Label runat="server" ID="lblFName1" /><br /> <asp:Label runat="server" ID="lblFName2" /><br /> <asp:Label runat="server" ID="lblFName3" /><br /> <asp:Label runat="server" ID="lblFName4" /><br /> [Serializable] public class Recipient { public string name { get; set; } } public List<Recipient> recipientList { get { if (ViewState["recipientList"] != null) return (List<Recipient>)ViewState["recipientList"]; return new List<Recipient>(); } set { ViewState["recipientList"] = value; } } protected void btnEnter_Click(object sender, EventArgs e) { List<Recipient> recipient = recipientList; recipient.Add(new Recipient{ name = txtFName.Text.Trim()}); recipientList = recipient; int count = recipient.Count; if (count == 1) lblFName.Text = recipientList[0].name; if (count > 1) lblFName1.Text = recipientList[1].name; if (count > 2) lblFName2.Text = recipientList[2].name; if (count > 3) lblFName3.Text = recipientList[3].name; if (count > 4) lblFName4.Text = recipientList[4].name; } </code></pre>

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