In form one
Response.Redirect("default3.aspx?DEMO_APPLICATION="+txtname.Text+"& DEMO_APPLICATION1=" +txtpwd.Text+"&DEMO_APPLICATION2="+txtpassword.Text+"&DEMO_APPLICATION3="+ txtadd.Text+"&DEMO_APPLICATION4="+ txtfull.Text+"&DEMO_APPLICATION5="+ DropDownList1.SelectedIndex);
And in form2 you need to access the query string
like
string demoApplicationName=Convert.Tostring( Page.Request.Param["DEMO_APPLICATION1"])
same for other variable DEMO_APPLICATION2
Replace demoApplicationName with the textbox you want to set the data into.