How can I Rollback My Installation

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C#

I developed application in C# & I create its setup & deployment. I want to add serial key in setup of my application. When this serial key is right that time install my application otherwise rollback my application. I have been adding the textbox through User Interface (add dialog).
Please check the following code

public override void Install(System.Collections.IDictionary stateSaver)
{
base.Install(stateSaver);
try
{
Boolean uninstall = true;
string serialKey = Context.Parameters["PathValue"];
if (serialKey!= "abcd")
{
uninstall = false;
}
using (var inst = new AssemblyInstaller(typeof(LicenseViewer.Program).Assembly, new string[] { }))
{
IDictionary state = new Hashtable();
inst.UseNewContext = true;
try
{
if (uninstall)
{
// inst.Uninstall(state);
inst.Rollback(state);
}
else
{
inst.Install(state);
inst.Commit(state);
}
}
catch
{
try
{
inst.Rollback(state);
}
catch (Exception e) { MessageBox.Show(e.Message); }
throw;
}
}

}
catch (Exception ex)
{ MessageBox.Show(ex.Message); }
}
When the Serial key is wrong that time before rollback I got the exception “Error 1001. Could not find the 'namespace.installstate' “.


I want to check serial key on textbox(add dialog).If key is wrong that time just show message invalid key not go to the next page like Microsoft Office setup.