How to Delete selected rows and Entire rows in a Unbounded DataGridView using a Delete Button in C# 2010?

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.NET

In My Project I'm Using a Unbounded DataGridView . In Which I made First Row as CheckBoxColumn With Header Check Box . I Provided My End User to select a single row or multiple row or Entire rows in DataGridView and can delete it if they need it . But the real Problem is When I Select all rows and click delete it deletes Entire rows and while i select a single row it performs the same action.

Below is my delete Button code .

private void BtnDcDelete_Click(object sender, EventArgs e)
    {
        do
        {
            foreach (DataGridViewRow row in dataGridViewEx1.Rows)
            {
                try
                {
                    dataGridViewEx1.Rows.Remove(row);
                }
                catch (Exception) { }
            }
        } while (dataGridViewEx1.Rows.Count > 1);
    }

[edit]Spurious big and bold removed, Code block added - OriginalGriff[/edit]