How Do I Add Rows To A Datagriview At Runtime,I.E. On Clicking A "Add" Buttonn And Store The Same In A Xml File?

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C#

XML

WinForms

Hi,

I am trying to add rows to a datagridview which contains 4 columns and the rows are added at run-time and also added to the XML file .The columns are as follows :
HOSTNAME IPADDRESS USERNAME PASSWORD

Whenever i am loading the form at run-time with some value in the xml file, it is getting populated .
But when i am trying to add data again by clicking on ADD button, it shows an "INVALIDOPERATOREXCEPTION- Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound."

My code while form loading

if (File.Exists(@"D:\HostAdded.xml") && new FileInfo(@"D:\HostAdded.xml").Length != 0)
                {
                    dataGridView1.DefaultCellStyle.ForeColor = Color.Red;
                    DataSet dataSet = new DataSet(); 
                    //DataView teamView = new DataView();
                    dataSet.ReadXml(@"D:\HostAdded.xml");
                    //teamView = dataSet.Tables[0].DefaultView;
                    //dataGridView1.DataSource = dataSet.Tables["Table1"];
                    dataGridView1.AutoGenerateColumns = false;
                    dataGridView1.DataSource = dataSet;
                    dataGridView1.DataMember = "Table1";
                    this.Cursor = Cursors.Default;
                }

XML file

<NewDataSet>
  <Table1>
    <Host-Name>ixin-varsha</Host-Name>
    <Ip_Address>10.205.26.42</Ip_Address>
    <User_Name>wefwe</User_Name>
    <Password>wwqefwe</Password>
  </Table1>
</NewDataSet>

Adding client at runtime by clicking on add button

if (File.Exists(@"D:\HostAdded.xml"))
{
     List<string> Items = GetItemsFromXmlUsingTagNames(@"D:\HostAdded.xml", "Host-Name");
     if (!Items.Contains(txthostname.Text))
     {
         int returnValue = CreateConnection(txthostname.Text);
         if (returnValue == 1)
         {
             ipAddr = DoGetHostAddresses(txthostname.Text);
             dataGridView1.DefaultCellStyle.ForeColor = Color.Red;
             dataGridView1.Rows.Add(txthostname.Text, ipAddr, txtusername.Text, txtpassword.Text);//Error occurs here
             txtLog.AppendText("\nRow added successfully");
             createXML();
             txthostname.Text = "";
             txtusername.Text = "";
             txtpassword.Text = "";
             populateComboBox();
          }
       }
}

private void createXML(string filename)
        {
            DataTable dt = new DataTable();
            foreach (DataGridViewColumn col in dgvIsland.Columns)
            {
                dt.Columns.Add(col.HeaderText);
            }
            foreach (DataGridViewRow row in dgvIsland.Rows)
            {
                DataRow dRow = dt.NewRow();
                foreach (DataGridViewCell cell in row.Cells)
                {
                    dRow[cell.ColumnIndex] = cell.Value;
                }
                dt.Rows.Add(dRow);
            }
            DataSet ds = new DataSet();
            ds.Tables.Add(dt);
            ds.WriteXml(filename);
        }

Please help me to identify the error!!
Thyanks a lot!! :)