Shorten (Truncate) Long text string using C# and VB.Net

Please refer below sample:

HTML

<div>
    Message:
    <asp:TextBox runat="server" ID="txtMessage" />
    <asp:Button Text="Submit" runat="server" OnClick="Submit" /><br />
    <asp:Label ID="lblMessage" runat="server"></asp:Label>
</div>

C#

protected void Submit(object sender, EventArgs e)
{
    if (this.txtMessage.Text.Length > 5)
        this.lblMessage.Text = this.txtMessage.Text.Substring(0, 5) + ".....";
    else
        this.lblMessage.Text = this.txtMessage.Text;
}

VB.Net

Protected Sub Submit(sender As Object, e As EventArgs)
    If Me.txtMessage.Text.Length > 5 Then
        Me.lblMessage.Text = Me.txtMessage.Text.Substring(0, 5) + "....."
    Else
        Me.lblMessage.Text = Me.txtMessage.Text
    End If
End Sub

Screenshot