ASP .NET Wizard Control and View State - asp.net

Question

I have a form with 3 wizard steps, and when i click the button to dynamically add text boxes, that works fine, but when i go to the next step and i click on add to add more text boxes, it automatically adds all the text boxes from the previous steps and then continues to add if i keep click on it.
How do i prevent that from happening.
private List ControlsList
{
get
{
if (ViewState["controls"] == null)
{
ViewState["controls"] = new List();
}
return (List)ViewState["controls"];
}
}
private int NextID
{
get
{
return ControlsList.Count + 1;
}
}
protected override void LoadViewState(object savedState)
{
string section = Wizard1.ActiveStep.ID;
int sectionNum = Wizard1.ActiveStepIndex;
var control = Wizard1.ActiveStep.FindControl("Place" + sectionNum) as PlaceHolder;
base.LoadViewState(savedState);
int count = 0;
foreach (string txtID in ControlsList)
{
if (count == 0)
{
control.Controls.Add(new LiteralControl("<tr>"));
}
TextBox txt = new TextBox();
control.Controls.Add(new LiteralControl("<td>"));
txt.ID = txtID;
control.Controls.Add(txt);
control.Controls.Add(new LiteralControl("</td>"));
count = count + 1;
if (count == 3)
{
control.Controls.Add(new LiteralControl("</tr>"));
count = 0;
}
}
}
protected void AddControlButton_Click(object sender, EventArgs e)
{
string section = Wizard1.ActiveStep.ID;
int sectionNum = Wizard1.ActiveStepIndex;
var control = Wizard1.ActiveStep.FindControl("Place" + sectionNum) as PlaceHolder;
TextBox txt1 = new TextBox();
TextBox txt2 = new TextBox();
TextBox txt3 = new TextBox();
txt1.ID = section.ToString() + "Size" + NextID.ToString();
control.Controls.Add(new LiteralControl("<td>"));
control.Controls.Add(txt1);
control.Controls.Add(new LiteralControl("</td>"));
ControlsList.Add(txt1.ID);
txt2.ID = section.ToString() + "Description" + NextID.ToString();
control.Controls.Add(new LiteralControl("<td>"));
control.Controls.Add(txt2);
control.Controls.Add(new LiteralControl("</td>"));
ControlsList.Add(txt2.ID);
txt3.ID = section.ToString() + "Quantity" + NextID.ToString();
control.Controls.Add(new LiteralControl("<td>"));
control.Controls.Add(txt3);
control.Controls.Add(new LiteralControl("</td></tr>"));
ControlsList.Add(txt3.ID);
}

Answer 1

You are storing all of the dynamic textboxes in ViewState and then the ControlsList property getter is returning the whole list when it is building the textboxes.
My recommendation is to use Session cache instead of ViewState, because it will allow you to differentiate the textbox controls from each of the wizard steps, like this:
Session["WizardStep1"] = listOfTextBoxesFromStep1;
Session["WizardStep2"] = listOfTextBoxesFromStep2;
Session["WizardStep3"] = listOfTextBoxesFromStep3;