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

To pass null value to db you can use DBNull.Value. Please try this

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