title: Insert Null value to the Integer Column
body: <p>Through the front end I want to insert NULL value to the Column whose DataType is Int.</p>
  
  <p>I used like this:</p>
  
  <pre><code>POP.JobOrderID = Convert.ToInt32(DBNull.Value);
  </code></pre>
  
  <p>But I cannot Insert Null value, it throws error such as "Object cannot be cast from DBNull to other types":</p>
  
  <p>How to insert NULL values? </p>