How do I get PasswordHash value?

When I try to save a new (inserted) record via the following code:

 

DataRow row = dataTable.Rows [currRec];

 

// update data in DataSet from data entry WinForm 

row.BeginEdit ();

row ["Title"] = txtTitle.Text;

row ["FirstName"] = txtFirstName.Text;

row ["MiddleName"] = txtMiddleName.Text;

row ["LastName"] = txtLastName.Text;

row ["Suffix"] = txtSuffix.Text;

row ["Phone"] = txtPhone.Text;

row ["EmailAddress"] = txtEmailAddress.Text;

row.EndEdit ();

 

try

{

    dataAdapter.Update (dataSet, "Person.Contact");

}

catch (System.Runtime.InteropServices.ExternalException exc)

{

    MessageBox.Show (exc.Message);

}

 

I get the following exception message:

 

Cannot insert the value NULL into column 'PasswordHash', table 'AdventureWorks.Person.Contact'; column does not allow nulls. INSERT fails. The statement has been terminated.

 

How do I get an appropriate PasswordHash value that I can put it in the newly-created record I'm inserting into the database?

 

For what it’s worth, the environment I’m working in is:

 

32-bit

SQL Server 2008 Express with Advanced Services

database:SQL2008 AdventureWorks (schema.table: Person.Contact)

SQL Server 2008 Management Studio Express

Visual C# 2008 Express