I am in fix that is,I have a from that contain a text box,I can input data into the text box.If the window is minimized the text box cant input data.How can i insert data into that text box when it is minized

Do you mean programmatically pushing data to the text box while the window is minimized or somehow taking user input while the window is minimized? Programmatically isn't a problem as long as you have a timer or an event that fires while the window is minimized. I can't think of an easy way to take user input while the window itself doesn't have input focus.