Binding data to textbox command

Hi helper,
I have 2 tables as follows:
Product table:
Product_Num LabelType
1111 12
2222 23
3333 10
4444 22
etc....
Data Type table:
Id Product_Num Data_Type Data
1 1111 1 20.3
2 1111 2 33.6
3 1111 3 10
4 2222 1 15
etc....

I have 3 controlls on the form and I need them to be bind with 'Data' column of Data Type table.
Each text control should show different data according to the Data_Type value.
How can it be done???
I tried the following:

DataView dv1 = new DataView();
dv1.Table = dataSet.Tables["Data_Type];

dv1.AllowDelete = true;
dv1.AllowEdit = true;
dv1.AllowNew = true;
dv1.RowFilter = " Data_type = '1'";
dv1.RowStateFilter = DataViewRowState.OriginalRows;
dv1.Sort = "Data";
txtPrice1.DataBindings.Add("Text", dv1, "Data");

I get empty text in the controls.
Why can't I Use the DataView? it should be perfect for me.

Please advise
Yossi