duplicate data is not insert in table using mvc 4

Question

for example :<div><table border="0" cellspacing="2" cellpadding="2" width="500"><tbody><tr><td>&nbsp;id</td><td>&nbsp;name</td><td>&nbsp;email</td><td>&nbsp;dob</td></tr><tr><td>&nbsp;1</td><td>&nbsp;rakesh</td><td>&nbsp;[email protected]</td><td>&nbsp;12-12-2012</td></tr><tr><td>&nbsp;2</td><td>&nbsp;sameer&nbsp;</td><td>&nbsp;[email protected]</td><td>&nbsp;11-11-2011</td></tr></tbody></table></div><div>&nbsp;</div><div>&nbsp;</div><div>then <span style="background-color: #ffcc00;">Samee</span><span style="background-color: #ffcc00;">r </span>and <span style="background-color: #ffff99;">rakesh </span>is not insert in table using mvc 4 , linq code </div><div>&nbsp;</div><div>please help me </div><div>its urgent ....&nbsp;</div>