I am using ASP.net 2012. (C# AS CODE BEHIND)
I have a parent window (ParentMain.asp x), I was able to open a new window (SampleChild1.a spx) from the parent window using below script on aspx.cs:
Code:
string strScript = string.Format("window.open('/Sample.UI/SampleChild1.aspx','window','toolbar=no,hotkeys=no,location=no,directories=no,menubar=no,scrollbars=yes,status=1,resizable=0,width=600,height=500');");