title: how to merge the dataset
body: <p>hai friends</p>
  
  <h2>I am one dataset like this ds like  three columns this:</h2>
  
  <h2>tblkey   Empkey    Empname</h2>
  
  <p>T101     E10           Natraj<br>
  T102     E11           Siva<br>
  T103     E14          ganesh  </p>
  
  <h2>I am having another dataset ds1 only two columns  like this:</h2>
  
  <p>Empkey        Empname<br>
  E10           karthi<br>
  E11           thriu<br>
  E13           maran  </p>
  
  <p>i waant merge the dataset and check the values  while checking  if ds is not having E13 it should bind and show the result like this  ds</p>
  
  <h2>tblkey   Empkey    Empname</h2>
  
  <p>T101     E10           Natraj<br>
  T102     E11           Siva<br>
  T103     E14          ganesh<br>
           E13           maran<br>
  here 'tblkey' comes empty<br>
  how to do:  </p>