C# Win App - Radiobutton if statements

[Greyskull]

        //button to display branch name
        private void btnBranch_Click(object sender, EventArgs e)
        {
            //if no branch is selected
            if (rbtnKnight.Checked == false && rbtnWbldon.Checked == false && rbtnKston.Checked == false)
            {
                //show error message
                MessageBox.Show("Please select Branch!", "Error!");
            }

            else
            {
                //if user selects knightsbridge branch
                if (rbtnKnight.Checked == true)
                {
                    txtBranch.Text = "Knightsbridge";
                    btnCost.Focus();        //sets focus in the Cost button when msg is displayed
                }

                //if user selects Wimbledon branch  
                if (rbtnWbldon.Checked == true)
                {
                    txtBranch.Text = "Wimbledon";
                    //set focus on btnCost once branch name is displayed
                    btnCost.Focus();
                }

                //if user selects Kingston branch
                if (rbtnKston.Checked == true)
                {
                    txtBranch.Text = "Kingston";
                    //set focus on btnCost once Kingston branch is displayed
                    btnCost.Focus();
                }
            }

        }

The radiobuttons are placed in a group box (grpBranch)

Is there a way to make this better i.e making it to a switch statement?

Thanx in advance