How do I change the value for a specific row in a datagridview control if the user selects a value from a combobox within the datagridview

I have a VS 2010 C# Windows application, with a datagridview control on the form. Everytime the user selects a different item from the "Task" combobox in the datagridview control, I want the "BudgetedHours" value to change for that row. How would I go this?

Below is the code I have so far.

private void AddComboBoxColumns()
        {
            DataGridViewComboBoxColumn comboboxColumn;
            comboboxColumn = CreateComboBoxColumn();
            SetAlternateChoicesUsingDataSource(comboboxColumn);
            comboboxColumn.HeaderText = "Task";

            //comboboxColumn.ValueMember = "TaskID";
            dgTime.Columns.Insert(2, comboboxColumn);
            dgTime.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dgTime_EditingControlShowing);
        }

        private void SetAlternateChoicesUsingDataSource(DataGridViewComboBoxColumn comboboxColumn)
        {
            OperationsDataContext dc = new OperationsDataContext();
            {
                comboboxColumn.DataSource = dc.Tasks_GetByProjectID(Convert.ToInt32(cboTimeProject.SelectedValue));
                comboboxColumn.ValueMember = "TaskID";
                comboboxColumn.DisplayMember = "TaskDescription";
            }
        }

        private void dgTime_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            ComboBox combo = e.Control as ComboBox;
            if (combo != null)
            {
                // Remove an existing event-handler, if present, to avoid 
                // adding multiple handlers when the editing control is reused.
                combo.SelectedIndexChanged -=
                    new EventHandler(ComboBox_SelectedIndexChanged);

                // Add the event handler. 
                combo.SelectedIndexChanged +=
                    new EventHandler(ComboBox_SelectedIndexChanged);
            }
        }

        private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            //((ComboBox)sender).BackColor = (Color)((ComboBox)sender).SelectedItem;
            using (OperationsDataContext dc = new OperationsDataContext())
            {
                //dc.Tasks.InsertOnSubmit(del);
                //dc.SubmitChanges();

                //MessageBox.Show("Deliverable successfully saved.", "Deliverable", MessageBoxButtons.OK);
                var hours = dc.Tasks_GetByTaskID(Convert.ToInt32(((ComboBox)sender).SelectedValue));

                DataGridViewColumn col = (DataGridViewColumn)dgTime.Columns["BudgetedHours"];
                foreach (var hour in hours)
                {
                    col.DataPropertyName = Convert.ToString(hour.OriginalBudget);
                }
            }

        }

        private DataGridViewComboBoxColumn CreateComboBoxColumn()
        {
            DataGridViewComboBoxColumn column = new DataGridViewComboBoxColumn();
            {
                //if (!isNewRow)
                //{
                column.DataPropertyName = "TaskID";
                //}
                column.HeaderText = "Task";
                column.DropDownWidth = 160;
                column.Width = 160;
                column.MaxDropDownItems = 3;
                column.FlatStyle = FlatStyle.Flat;
            }
            return column;
        }

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DatagridviewControl.png