Hello everybody

I`ve created a WebForms applications for learning purposes. I`ve placed two TextBoxes on my WebForm1 using the Visual Studio toolbox. The code is shown below :

Code:
<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
<br />
Last Name:
<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
<br />
Now in the corresponding WebForm1.aspx.cs coding file I`m trying to export the functionality of these two controls by creating the attribute FullName

Code:
public string FullName
{
get { return txtFirstName.Text + " " + txtLastName.Text; }
}
Unfortunately, when I compile my code I get the error :

Code:
Error	1	The name 'txtFirstName' does not exist in the current context
Shouldn`t the control be in context since I`m placing it on the same WebForm1 as the corresponding cs file?