Question

Here is a method I am using to create a datagridview and then add 2 comboboxes. Three DataTables get loaded from other classes.

public void GetWorkorderItems()
        {
        Workorders wo = new Workorders();
        ItemTable = wo.LoadWorkorderItemsTable(_ID);


        this.datagridWorkorderItems.DataSource = ItemTable;
        this.datagridWorkorderItems.AutoGenerateColumns = true;
        this.datagridWorkorderItems.Columns[0].Visible = false;
        this.datagridWorkorderItems.Columns[1].HeaderText = "Qty";
        this.datagridWorkorderItems.Columns[1].Width = 100;
        this.datagridWorkorderItems.Columns[2].HeaderText = "Part";
        this.datagridWorkorderItems.Columns[2].Width = 100;
        this.datagridWorkorderItems.Columns[3].HeaderText = "Labor";
        this.datagridWorkorderItems.Columns[3].Width = 100;
        this.datagridWorkorderItems.Columns[4].HeaderText = "Price";
        this.datagridWorkorderItems.Columns[4].Width = 150;
        this.datagridWorkorderItems.Columns[5].HeaderText = "Description";
        this.datagridWorkorderItems.Columns[5].Width = 150;

        Parts part = new Parts();
        DataTable partdata = new DataTable();
        partdata = part.LoadPartTable();
        DataGridViewComboBoxColumn pcb = (DataGridViewComboBoxColumn)this.datagridWorkorderItems.Columns[2];
        pcb.DataSource = partdata;
        pcb.DisplayMember = "PartName";
        pcb.ValueMember = "PartID";
        datagridWorkorderItems.Columns.Add(pcb);

        Labor labor = new Labor();
        DataTable data = new DataTable();
        data = labor.LoadLaborTable();
        DataGridViewComboBoxColumn cb = (DataGridViewComboBoxColumn)this.datagridWorkorderItems.Columns[3];
        cb.DataSource = data;
        cb.DisplayMember = "LaborItem";
        cb.ValueMember = "LaborID";
        datagridWorkorderItems.Columns.Add(cb);

        }

When the code gets to the creation of the DataGridViewComboBox object the code exits the method and does not add or load the comboboxes. There is no exception thrown either.

Any help?

EDIT****
DataGridViewTextBoxColumn col0 = (DataGridViewTextBoxColumn)this.datagridWorkorderItems.Columns[0];
this.datagridWorkorderItems.Columns[0].DataPropertyName = “WOItemID”;
this.datagridWorkorderItems.Columns[0].Visible = false;
this.datagridWorkorderItems.Columns.Add(col0);

        DataGridViewTextBoxColumn col1 = (DataGridViewTextBoxColumn)this.datagridWorkorderItems.Columns[1];
        this.datagridWorkorderItems.Columns[1].DataPropertyName = "Quantity";
        this.datagridWorkorderItems.Columns[1].HeaderText = "Qty";
        this.datagridWorkorderItems.Columns[1].Width = 100;
        this.datagridWorkorderItems.Columns.Add(col1);

        DataGridViewComboBoxColumn pcb = (DataGridViewComboBoxColumn)this.datagridWorkorderItems.Columns[2];
        pcb.DataSource = partdata;
        pcb.DisplayMember = "PartName";
        pcb.ValueMember = "PartID";
        datagridWorkorderItems.Columns.Add(pcb);

This might be the way to build the columns if I understand.

***Fixed code that works******

public void GetWorkorderItems()
        {
        Workorders wo = new Workorders();
        ItemTable = wo.LoadWorkorderItemsTable(_ID);

        Parts part = new Parts();
        DataTable partdata = new DataTable();
        partdata = part.LoadPartTable();

        Labor labor = new Labor();
        DataTable data = new DataTable();
        data = labor.LoadLaborTable();


        this.datagridWorkorderItems.AutoGenerateColumns = false;

        DataGridViewTextBoxColumn col0 = new DataGridViewTextBoxColumn();
        col0.DataPropertyName = "WOItemID";
        col0.Visible = false;
        this.datagridWorkorderItems.Columns.Add(col0);

        DataGridViewTextBoxColumn col1 = new DataGridViewTextBoxColumn();
        col1.DataPropertyName = "Quantity";
        col1.HeaderText = "Qty";
        col1.Width = 100;
        this.datagridWorkorderItems.Columns.Add(col1);

        DataGridViewComboBoxColumn col2 = new DataGridViewComboBoxColumn();
        col2.DataPropertyName = "PartID";
        col2.DataSource = partdata;
        col2.DisplayMember = "PartName";
        col2.ValueMember = "PartID";
        col2.HeaderText = "Part";
        datagridWorkorderItems.Columns.Add(col2);

        DataGridViewComboBoxColumn col3 = new DataGridViewComboBoxColumn();
        col3.DataPropertyName = "LaborID";
        col3.DataSource = data;
        col3.DisplayMember = "LaborItem";
        col3.ValueMember = "LaborID";
        col3.HeaderText = "Labor";
        datagridWorkorderItems.Columns.Add(col3);

        DataGridViewTextBoxColumn col4 = new DataGridViewTextBoxColumn();
        col4.DataPropertyName = "Price";
        col4.HeaderText = "Price";
        col4.Width = 100;
        this.datagridWorkorderItems.Columns.Add(col4);

        DataGridViewTextBoxColumn col5 = new DataGridViewTextBoxColumn();
        col5.DataPropertyName = "Description";
        col5.HeaderText = "Description";
        col5.Width = 100;
        this.datagridWorkorderItems.Columns.Add(col5);

        this.datagridWorkorderItems.DataSource = ItemTable;

        }

Answer 1

Try something like this:

public ExampleForm()
    {
        InitializeComponent();
        datagridWorkorderItems.AutoGenerateColumns = false;

        DataGridViewTextBoxColumn qtyColumn = new DataGridViewTextBoxColumn();
        qtyColumn.DataPropertyName = "Qty";
        qtyColumn.HeaderText = "Qty";
        datagridWorkorderItems.Columns.Add(qtyColumn);

        DataGridViewComboBoxColumn partColumn = new DataGridViewComboBoxColumn();
        partColumn.Items.Add(new Part() { ID = 0, PartName = "Tire" });
        partColumn.Items.Add(new Part() { ID = 1, PartName = "Motor" });
        partColumn.HeaderText = "Part";
        partColumn.DataPropertyName = "PartID";
        partColumn.ValueMember = "ID";
        partColumn.DisplayMember = "PartName";
        datagridWorkorderItems.Columns.Add(partColumn);

        List<WorkOrder> workOrders = new List<WorkOrder>();
        workOrders.Add(new WorkOrder() { Qty = 0, PartID = 0});
        workOrders.Add(new WorkOrder() { Qty = 2, PartID = 1});

        datagridWorkorderItems.DataSource = workOrders;
    }
}

public class WorkOrder
{
    public int Qty { get; set; }
    public int PartID { get; set; }
}

public class Part
{
    public int ID { get; set; }
    public string PartName { get; set; }
}