how Create TextBox dynamically and how to retrieve text box value using asp.net and c#

You create dynamic textbox (or any control) as

TextBox myTextBox = new TextBox();
dynamictextbox.Text = "This is dynamically added text box";
this.Controls.Add(myTextBox);

Write this code in Page_Load.

To read value,

string myTextBoxValue = myTextBox.Text;

Hope that helps
Milind

1>first create object of text box or any control which you want to generate control
TextBox txt = new TextBox();

2>Pass value to object
txt.Text = "This is dynamically added text box";

3>add control in page
this.Controls.Add(txt);