Question

I am confused in how to use ViewState in C#, for example what is the benefit of using:

ViewState["VST"]="Value1";

Lable1.Text= ViewState["VST"].ToString();

Whereas I can use:

string container= "Value1";
Lable1.Text= container;

Answer 1

Your ViewState consists of variables that are kept with the post-backs of your page, because they are sent to the client and the client sends them back with the entire page.

Hence, if you do:

string container= "Value1";
Lable1.Text= container;

Then the users sees the page and hits the submit button, your container string will not exist.

If however you uses the ViewState, ViewState[“VST”] will still have the value as it will be “refreshed” when the user submits and sends the page back.

Read more here and also understand the ASP.NET page life cycle.