viewstate??

[Mikael Janers]

Hello!

Does anyone have any information about how a
System.Web.UI.WebControls.TextBox keeps its value between posts ?
Everywhere I read it says it's the viewstate. But clearly it isn't because
if you override the controls viewstate functions and even disable viewstate
on the page the control still keep its value on a postback??

// Mikael

 

[Ruslan]

Hello!

Does anyone have any information about how a
System.Web.UI.WebControls.TextBox keeps its value between posts ?
Everywhere I read it says it's the viewstate. But clearly it isn't because
if you override the controls viewstate functions and even disable viewstate
on the page the control still keep its value on a postback??

// Mikael

If TextBox has Visible = False, it keeps it's value in the viewstate,
otherwise it loads the text from the postback data.

The execution flow is somewhat like this:

Page.ProcessRequestMain() -> Page.ProcessPostData() ->
IPostBackEventHandler(control).LoadPostData() ->
Control.LoadPostData()

The actual implementation for the TextBox is here:

private bool System.Web.UI.IPostBackDataHandler.LoadPostData(string
postDataKey, NameValueCollection postCollection)
{
if (!this.Text.Equals(postCollection[postDataKey]))
{
this.Text = postCollection[postDataKey];
return true;
}
return false;
}