Set default data Datagridview column

Hello,

I have a Data Grid view with Columns, i want the column UProertyNo to have a default value from a text box.
I'm showing the UPropertyNo Column to enter the data manually, but actually i want to hide it and insert in it the data which is in a text box.

My code for getting data to data grid view is:

Code:

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Try
            sqL = "SELECT UProertyNo, UNo, UType,
                  UFloor, UCapacity,USala, URooms,UKitchens,
                  UBaths, UMonthlyRent, UArea, UElectricity,
                  UWater, UMaintenance FROM UnitMainFile WHERE UProertyNo = '" & txt_PropertyNo.Text & "'"
            ConnDB()
            cmd = New SqlCommand(sqL, conn)
            da = New SqlDataAdapter(cmd)
            ds = New DataSet()
            da.Fill(ds, "UnitMainFileMainFile")
            dgv_PropertyFlatsDetails.DataSource = ds.Tables("UnitMainFileMainFile").DefaultView
            dgv_PropertyMainFile.Rows(dgv_PropertyFlatsDetails.RowCount - 1).DefaultCellStyle.ForeColor = Color.Red
            conn.Close()
        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try

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And my Code for updating the data grid view is:

Code:

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cmdbl = New SqlCommandBuilder(da)
        da.Update(ds, "UnitMainFileMainFile")
        MessageBox.Show("Done")

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Thanks in advance.