[RESOLVED] Add value selected row Datagrid

how to add value to selected row at datagridview control.
hire my code to display and add row at datagrid :

vb.net Code:

Public Class Form2
    Dim dt As New DataTable("view")
 
    Private Sub Form2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        dt.Columns.Add(New DataColumn("Col1"))
        dt.Columns.Add(New DataColumn("Col2"))
        
 
        dg.DataMember = "view"
        dg.DataSource = dt
 
 
    End Sub
 
    'new rows
    Private Sub btnAddRow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddRow.Click
        Dim dr As DataRow
        dr = dt.NewRow
        dr.Item(0) = ""
        dr.Item(1) = ""
        dt.Rows.Add(dr)
 
    End Sub
 
    'add value at selected row
    Private Sub addValue_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles addValue.Click
        ' ???
 
    End Sub
End Class

thank you

First up, you shouldn't be setting the DataMember. You would only set the DataMember to the name of a DataTable if you were setting the DataSource using a DataSet containing that DataTable. Your DataTable is the DataSource so there is no DataMember.

As for the question, you should bind your table to the grid via a BindingSource. That way, you can use the Current property of the BindingSource to get a DataRowView for the current row. You then set it's fields by name or index:

vb.net Code:

Me.BindingSource1.DataSource = dt
dg.DataSource = Me.BindingSource1

vb.net Code:

Dim row = DirectCast(Me.BindingSource1.Current, DataRowView)
 
row(0) = firstColumnValue
row("ColumnName") = namedColumnValue

Thank you code can run with either
But what if the datagrid I is not connected to the database?

There's no such thing as a control connected to a database. Controls are bound to a list of data. That list might be a DataTable or it might be something else. Even if it's a DataTable, where the data in that table came from is irrelevant to the control. It might be a database or it might not, but a DataTable is a DataTable. If you are binding any list to the grid then do so via a BindingSource and get the current item from the Current property. The type of that object will depend on the type of data you bound in the first place.

For a grid that isn't bound, which would be the exception rather than the rule, you can use the grid's CurrentRow property. That assumes that the control is actually a DataGridView rather than a DataGrid.