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 for inserting into the table. My problem is when I try to insert a null value into my table's datetime column it throws error. my code is as.

    System.Data.SqlTypes.SqlDateTime getDate;
//set DateTime null
getDate = SqlDateTime.Null;

if (InsertDate.Text == "")
{
cmd1.Parameters["@InsertDate"].Value = getDate;
}
else
{
cmd1.Parameters["@InsertDate"].Value = InsertDate.Text;
}

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).