DataGridView选中行的背景色如何去掉
DataGridView选中的行总有背景色，也就是DefaultCellStyle.SelectionBackColor这个属性。
这个属性不能设置成空，设成空则为默认蓝色。

还有DataGridView默认选中第一行或第一个单元格。如何设置不选中任何一行？
[解决办法]
private void dgv_SelectionChanged(object sender, EventArgs e)
{
DataGridView dgv = sender as DataGridView;
dgv.ClearSelection();
}
[解决办法]

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        With DataGridView1
            .ColumnCount = 6
            .Rows.Add(10)
            .DefaultCellStyle.SelectionBackColor = .DefaultCellStyle.SelectionForeColor
        End With
    End Sub

    Private Sub DataGridView1_GotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGridView1.GotFocus
        DataGridView1.CurrentCell = Nothing
    End Sub
End Class

[解决办法]
dataGridView1.ClearSelection();
或者
dataGridView1.CurrentCell=null;


if (ds.Tables[0].Rows.Count > 0)
{
dataGridView1.Rows[0].Selected = false
}