Insert from xml to sql server table

I have the following xml file looks like :

<test>
    <test2>
        <A>206942</A>
</test2>
    <test2>
        <A>203405</A>
</test2>
</test>

I need to insert into sql server table

XmlNodeList dataNodes = xmlDoc.SelectNodes("/test/test2");

                SqlConnection dbConnection = new SqlConnection(connectionString);
                try
                {
                    dbConnection.Open();

                    foreach (XmlNode node in dataNodes)
                    {
                        String A= (node.SelectSingleNode("A") != null) ? node.SelectSingleNode("A").InnerText.ToString() : string.Empty;
                                                   try
                        {
                            using (SqlCommand cmd = dbConnection.CreateCommand())
                            {
                             cmd.Parameters.AddWithValue(" @A", A);
                             cmd.ExecuteNonQuery();
                            }
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                    }
                }

I try the code above and I always get the following error :

Incorrect syntax near @A Must declare the scalar variable @A

How to resolve it ?