Unbound Datagridview

[Unter]

VB.2005 - Please help - I've been trying for days to find some simple code samples to programatically add and remove data from an unbound Datagridview. I only have 3 coloums of 3 rows and there should be no editing by the user, except to click a checkbox. All other data is added by the program. I can create the coloumns and the rows OK but cant seem to get data in and out of the cells. Any pointers would be appreciated.

[Plater]

When adding data to Rows, you need to index by column, not by integer(for some reason the data doesn't get in there if you use integer indexing)

[Frinavale]

VB.2005 - Please help - I've been trying for days to find some simple code samples to programatically add and remove data from an unbound Datagridview. I only have 3 coloums of 3 rows and there should be no editing by the user, except to click a checkbox. All other data is added by the program. I can create the coloumns and the rows OK but cant seem to get data in and out of the cells. Any pointers would be appreciated.

Could you please post the code you have for creating the DataSource for your GridView.

[Plater]

For a given DataGridView that already has columns assigned to it:

//create a new row with the correct columns
int newRowIDX = dgvBOMConnections.Rows.Add();
//reference that row
DataGridViewRow dr = dgvBOMConnections.Rows[newRowIDX];
//add data to the row's "cells"
dr.Cells["myStringColumn"].Value = "some value";
dr.Cells["myIntColumn"].Value = 12;
dr.Cells["myBooleanColumn"].Value = False;
 

[Frinavale]

For a given DataGridView that already has columns assigned to it:

//create a new row with the correct columns
int newRowIDX = dgvBOMConnections.Rows.Add();
//reference that row
DataGridViewRow dr = dgvBOMConnections.Rows[newRowIDX];
//add data to the row's "cells"
dr.Cells["myStringColumn"].Value = "some value";
dr.Cells["myIntColumn"].Value = 12;
dr.Cells["myBooleanColumn"].Value = False;
 

I think that the problem is that the OP does not have any columns in the GridView.
I think they're creating a custom Table or other data source to the GridView and not properly binding it to the data.

[Plater]

I think that the problem is that the OP does not have any columns in the GridView.
I think they're creating a custom Table or other data source to the GridView and not properly binding it to the data.

Frinny makes a good point, It might be easier if you set up a DataTable object to be how you want it (3 Rows/columns etc) and fill that with data, THEN bind it to the DataGridView, rather then edit the contents of the DataGridView directly.

Perhaps it would be helpfull if you posted the code you are using?

[Unter]

Thanks so much for the response everyone - this is the stripped down code
The problem is the combobox values

  Dim dropcolumn As New DataGridViewComboBoxColumn
        Dim CheckColumn As New DataGridViewCheckBoxColumn
        Dim CheckColumn2 As New DataGridViewCheckBoxColumn
 
    Dim i As Integer = 0
                Dim temp As String = ""
 
    With dropcolumn
                     .Name = "Something1"
                     .HeaderText = "     Something1"
                         For i = 0 To 255
                              temp = array(i)
                                 If temp = "U" Then
                                     .Items.Add("Stock" + Str(i))
                                 End If
                         Next
                     End With
 
                    With CheckColumn
                       .Name = "Something2"
                       .HeaderText = "  Something2"
                    End With
 
                 With CheckColumn2
                    .Name = "Something3"
                    .HeaderText = "  Something3"
                 End With
 
        DG1.Columns.Insert(0, dropcolumn)
        DG1.Columns.Insert(1, CheckColumn)
        DG1.Columns.Insert(2, CheckColumn2)
 
        Dim Null_String As String = ""
        With Me.DG1.Rows
            .Add(Null_String)
        End With
 
        DG1.Rows(0).Cells(1).Value = True
        DG1.Rows(0).Cells(2).Value = True

This seems to work fine although I'm not sure why I need the null_string but
without it I get the error that the following lines are out of range.

My problem is when I want to add or remove items from the combobox.
Once the users has chosen an item from the combobox I need it removed
so it cant be chesen again.

dropcolumn.Items.Remove("ITEMNAME")
dropcolumn.Items.Remove(index)

Seems to have no effect - but no errors either

Even rerunning

.items.clear
For i = 0 To 255
temp = array(i)
If temp = "U" Then
.Items.Add("Stock" + Str(i))
End If

Doesnt effect the combobox contents

Hope this is clearer, thanks again