How Can I Add Google Maps For Australia In A C# Windows Forms?

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C#3.0

C#

WebBrowserControl

private void button6_Click(object sender, EventArgs e)
        {
            string street = txtstreet.Text;
            string city = txtcity.Text;
            string state = txtstate.Text;
            string zip = txtzip.Text;
            try
            {
                StringBuilder queryaddress = new StringBuilder();
                queryaddress.Append("https://maps.google.com.au/maps?q=");
                if(street != string.Empty)
                {
                    queryaddress.Append(street+",+");
                }
                if (city != string.Empty)
                {
                    queryaddress.Append(city+",+");
                }
                if (state != string.Empty)
                {
                    queryaddress.Append(state+",+");
                }
                if (zip != string.Empty)
                {
                    queryaddress.Append(zip+",+");
                }
                webBrowser1.Navigate(queryaddress.ToString());
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message.ToString(), "Error");
            }
        }

This is what i tried for generating the map.

I am getting script error for this code. i have four options for selection, city,street, state and zipcode. can anyone tell me why this error is coming? how can i troubleshoot?
please help