动态添加文本框并在按钮单击时捕获数据

I am adding text boxes dynamically and trying to capture data entered in text box on button click. but what is happening is , though I entered the data in the text box, when I clicked the button, the page is getting loaded and the control is getting created again. As a result , I am loosing the data in the text box. Can you tell me how can I capture this data entered to the dynamically created text boxes. My sample code is as follows:I am adding text boxes dynamically and trying t