DataGridView column bound to a read-only field must have ReadOnly set to True

Have you tried? (setting properties) :

AllowUserToAddRows = False
AllowUserToDeleteRows = False
ReadOnly = True

You can actually set the ReadOnly property for the DataTable column!

Dim dt As DataTable = oDL.GetTheItems()
dt.Columns("Selected").ReadOnly = false
DataGridView1.DataSource = dt

First Set DataTable ReadOnly Property False.

Then Set Gridview ReadOnly Property false.

DataTable dt=("Select * prom priceList");
dt.Columns["Rate"].ReadOnly = false;

DataGrid View dgv=.dataSource=dt;
dgv.Columns["Rate"].ReadOnly = false;