Is it possible to coalesce string and DBNull in C#?

Question

I\'m writing a C# routine to call a stored proc. In the parameter list I\'m passing in, it is possible that one of the values can legally be null. So I thought I\'d use a

Answer 1

The Null Coalesce operator only with with data of the same type. You cannot send NULL to the SqlParamater as this will make Sql Server says that you didn't specify the parameter.

You can use

new SqlParameter("@theParam", (object)theParam ?? (object)DBNull.Value)

Or you could create a function that return DBNull when null is found, like

public static object GetDataValue(object o)
{
    if (o == null || String.Empty.Equals(o))
        return DBNull.Value;
    else
        return o;
}

And then call

new SqlParameter("@theParam", GetDataValue(theParam))