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, sqlPara         


        

Answer 1

You can pass the DBNull.Value into the parameter's .Value property:

    SqlParameters[0] = new SqlParameter("LedgerID", SqlDbType.BigInt );
    SqlParameters[0].Value = DBNull.Value;

Just adjust for your two DateTime parameters, obviously - just showing how to use the DBNull.Value property value here.

Marc

Answer 2

I use a method to convert to DBNull if it is null

    // Converts to DBNull, if Null
    public static object ToDBNull(object value)
    {
        if (null != value)
            return value;
        return DBNull.Value;
    }

So when setting the parameter, just call the function

    sqlComm.Parameters.Add(new SqlParameter("@NoteNo", LibraryHelper.ToDBNull(NoteNo)));

This will ensure any nulls, get changed to DBNull.Value, else it will stay the same.