title: how to copy datatable column and value to another datatable
body: <p>I have a datatable dt1 with 4 column(Name,Address,Contact,Marks) which has 0 Rows, and I have another datatable dt2 with 2 column(StdName, StdAddress) with few Rows.</p>
  
  <p>when I am doing something like dt1 = dt2.copy(); then my dt1 is getting change. which I don't want.</p>
  
  <p>I want to copy dt2 column and value to dt1. so in my dt1's column(Name and Address) will fill with stdName and StdAddress Value.</p>
  
  <p>Please someone help me how to do that.</p>