Finding null value in Dataset - DataRow.IsNull method vs ==DbNull.Value - c#

Question

What are the benefits of using the c# method DataRow.IsNull to determine a null value over checking if the row equals DbNull.value?

if(ds.Tables[0].Rows[0].I         


        

Answer 1

DBNull.Value != null

DBNull.Value stands for a column having the value . Pop open a table and return some rows, see if any column in any row contains the (ctrl 0) value. If you see one that is equivalent to DBNull.Value.

if you set a value to null or DBNull.Value then you will want to use IsNull(). That returns true if the value is either null or DBNull.Value. Consider the following:

row["myCol"] = null;

row["myCol"] = DBNull.Value

if (row["myCol"] == DBNull.Value) //returns true

if (row["myCol"] == null) //returns false

if (row.IsNull("myCol")) //returns true

The point is if you are just checking for null or DBNull.Value use IsNull, if you are only checking for DBNull.Value explicitly say so and use that.