Hi John,

Do you mean to get the value of the primary key of the current row in a
DataGrid?

I think you could do this in two steps. The first step is to get the
current row in the DataGrid. The second step is to get the value of the
primary key of this row.

Step 1:  

You could make use of the Current property of CurrencyManager object that
are associated with the dataset to get the current row. You could use the
form's BindingContext property to get the CurrencyManger object.

Below is a sample code.

// this refers to the form that contains the dataset
DataRowView row =
(DataRowView)this.BindingContext[this.dataset11,"City"].Current;

Step 2:

You could make use of the PrimaryKey property of the DataTable to get the
array of columns that function as the primary keys of the DataTable. If
there's only one primary key in the DataTable, you could access it with
index 0.

Below is a sample code.

object keyvalue = row[this.dataset1.tableName.PrimaryKey[0].ColumnName];

Hope this helps.
If you have anything unclear, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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Heres what I do (it took me a while to figure out how to get a reference to
the DataView and/or DataRowView that the grid is bound to, when I am
explicitly binding the grid using something like
grdMyGrid.SetDataBinding(dsMyDataSet, "MyTableName")):
Note that this is for framework 1.1...

'First get the reference to the DataRowView
Dim dvMyRowView As DataRowView = grdMyGrid.BindingContext(dsMyDataSet,
"MyTableName").Current

'Now we have the DataRowView for our current selected grid row.
'Simply access the column you want using the PK column mapping name or the
row index.
Dim strValue As Object = dvMyRowView("MyPK")
Dim strValue2 As Object = dvMyRowView(0)

Hope that works.  Code may not be perfect, but I'm pretty sure its close.