Question

I have created a Datagridview with 4 Columns, EJ:

ID, Name, Quantity, other

But i want to fill these 3 Columns from MySQL EJ:

item_id, item_name, item_quantity

I tryed this code:

    Using cn As New MySqlConnection("server=10.10.2.1;userid=root;password=gf-159753;database=quick_admon")
        cn.Open()

        Dim da As New MySqlDataAdapter("SELECT * from qa_items", cn)
        ' DataTable  
        Dim dt As New DataTable

        ' llenar el DataTable  
        da.Fill(dt)

        ' enlazar el DataTable al BindingSource  
        list_items.DataSource = dt

        With list_items 
            .MultiSelect = False 
            .SelectionMode = DataGridViewSelectionMode.FullRowSelect

            .DataSource = list_items.DataSource
        End With

    End Using

but this creates new columns and does not write to the existing, took a while looking for a solution but only find methods like this.

Answer 1

You failed to bind the columns from your query into your datagrid view columns. To do this,

1.) Right Click DataGridView.
2.) A Popup Menu appears and Click Edit Columns
3.) Bind each columns (ID, Name, Quantity, other) by typing the field name (item_id, item_name, item_quantity) respectively from
your query in the DataPropertyName property (so that it will not
create another column like you did).

And you’re done!

UPDATE

Setting DataPropertyName Propgramatically

list_items.Columns("ID").DataPropertyName = "item_id"

or Assuming that ID is your first column:

list_items.Columns(0).DataPropertyName = "item_id"