How to pass a null variable to a SQL Stored Procedure from C#.net code

Question

Im calling a SQL stored procedure from a piece of C#.net code:

SqlHelper.ExecuteDataset(sqlConnection, CommandType.StoredProcedure, STORED_PROC_NAME, sqlParameters); 

where the sqlParameters variable is defined as:

        SqlParameter[] sqlParameters = new SqlParameter[SQL_NUMBER_PARAMETERS];          Log.Logger.Debug(string.Format("Running proc: {0} ", STORED_PROC_NAME));          SqlParameters[0] = new SqlParameter("fieldID", SqlDbType.BigInt );         SqlParameters[0].Value = fieldID;         SqlParameters[0].Direction = ParameterDirection.Input; 

I need to now pass in another two parameters to this Stored Proc, (both are of type SqlDateTime), which are going to NULL in this case.

Thanks,

IN

Answer 1

SqlParameters[1] = new SqlParameter("Date1", SqlDbType.SqlDateTime); SqlParameters[1].Value = DBNull.Value; SqlParameters[1].Direction = ParameterDirection.Input; 

...then copy for the second.

Answer 2

Use DBNull.Value Better still, make your stored procedure parameters have defaults of NULL. Or use a Nullable<DateTime> parameter if the parameter will sometimes be a valid DateTime object