Textbox readonly property does not postback

When the user sets the textbox property as readonly. It does not have the viewstate. So Value wont display or comes to the server. In order to achieve the output make the textbox readonly after getting the value like this

string s=textbox1.text;
textbo1.readonly=true;

Enabling and Disabling of buttons of prev, next, first and last

private void EnableOrDisableButtons()
{
//=== check the condition total no of pages is greater than zero ==============
if(TotalNumberOfPages >0){

//===== Initial setup =============
if(CurentPageNumber == 0)
{
CurentPageNumber = 1;
}

//===== Now the User is in First Page [Total page is 1] =============
if ((CurentPageNumber == 1) && ( CurentPageNumber == TotalNumberOfPages))
{
lnkFirst.Enabled = lnkPrev.Enabled = false;
}
//===== Now the User is in middle Page =============
else if (CurentPageNumber == 1 && CurentPageNumber < TotalNumberOfPages)
{
lnkFirst.Enabled = lnkPrev.Enabled = false;
lnkNextButton.Enabled = lnkLastButton.Enabled = true;
}
//===== here also Now the User is in middle Page =============
else if (CurentPageNumber > 1 && CurentPageNumber < TotalNumberOfPages)
{
lnkFirst.Enabled = lnkPrev.Enabled = lnkNextButton.Enabled = lnkLastButton.Enabled = true;
}
//===== Now the User is in last Page =============
else if (CurentPageNumber == TotalNumberOfPages)
{
lnkFirst.Enabled = lnkPrev.Enabled = true;
lnkNextButton.Enabled = lnkLastButton.Enabled = false;
}

//======= Setting the page Numbers=======
this.lblPage.Text = CurentPageNumber.ToString() + " of " + TotalNumberOfPages.ToString();

}