Best method of assigning NULL value to SqlParameter

Question

I have a number of optional input parameters I am using in a C# class method. Since the optional syntax creates a value of \'0\' when the parameter is not used, the SQL inse

Answer 1

Yes, for the value of the parameter, just use DBNull.Value. For example:

SqlParameter sqlError = 
    new SqlParameter("@errors", errors == 0 ? (object)DBNull.Value : errors);

Or write a little helper:

private object ValueOrDBNullIfZero(int val) {
   if ( val == 0 ) return DBNull.Value;
   return val;
}

Then:

SqlParameter sqlError = 
    new SqlParameter("@errors", ValueOrDBNullIfZero(errors));