How to insert null in datetime type column in sql server

Question

I have a table in which there are some datetime type columns. I use a stored procedure to insert values into the table. In the stored procedure I have variables that accept null

Answer 1

cmd1.Parameters["@InsertDate"].Value = getDate ?? DBNull.Value;

The key being DBNull.Value. I imagine you have a nullable DateTime variable, i.e. DateTime? someVariable. You can test it for null and if it is use DBNull.Value (as shown above).