How to tell if treeview has not selected any nodes datagridview has not selected any rows

fenril

1 How to tell if treeview has not selected any nodes?
2 How to tell if no rows are selected by datagridview?
3 How to tell if a cell in datagridview is empty?

maodanyun

1. if (treeView1.SelectedNode == null)

maodanyun

2. dataGridView1.SelectedRows.Count> 0

maodanyun

3. ataGridView1.SelectedRows [0] .Cells [9] ........
            dataGridView1.Rows [7] .Cells [9] .........

fenril

3 How to judge whether a cell in datagridview is empty?
——————————————————————————————
3. ataGridView1.SelectedRows [0] .Cells [9] ........
            dataGridView1.Rows [7] .Cells [9] .........

空水镜云

treeView1.SelectedNode==null
dataGridView1.CurrentRow==null