In page life cycle how can call this method loadviewState() ? if yes how?

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C

ASP.NET

In .aspx page am taking one text box and one button.

<asp:Textbox id="txtName" runat="server" Text="sai"/>

<asp:Button id="btnSubmt" rumat="server" OnClick="btnSubmt_Click"/>

in code behid

protected void btnSubmit_Click"(object sender, Eventsargs e)
{
    txtName.Text="ravi";
}

In these events( InIt,PreInIt and InItComplete ) the value of a textbox will not be change it has a default value.
after clicking on button

In loadviewstate we have the previous value i want see the that value programatically how can i

please help me