[C#] Someone can Help me fix this code Update Link SqlServer using C#

[lHatsu]

 Spoiler

namespace UpdateMaster
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
SqlConnection conn = new SqlConnection("Data Source=127.0.0.1;Initial Catalog=master;User Id=sa;Password=123456");


private void button1_Click(object sender, EventArgs e)
{
string SqlQuery = string.Format("UPDATE EXEC sp_addlinkedserver 'GHBILL','','MSDASQL',NULL,NULL,'DRIVER={SQL Server};SERVER=localhost;UID=;PWD=;'", conn);
SqlDataAdapter Adpter = new SqlDataAdapter(SqlQuery, conn);
Adpter.SelectCommand.ExecuteNonQuery();
conn.Close();
MessageBox.Show("Update SuccessFully!!!");
}
}
}

[Ludder231]

 Spoiler

PHP Code:

private MySqlConnection _connection;
        private MySqlCommand _command;
        private readonly string _connectionString = $"SERVER={Server};DATABASE={Database};UID={Username};PASSWORD={Password};SSL Mode=None";

public async void Update(string query, Dictionary<string, dynamic> parameters = null)
        {
            Console.WriteLine("Connection state: " + _connection.State);

            if (_connection.State != ConnectionState.Open)
            {
                await _connection.OpenAsync();
            }

            _command = new MySqlCommand(query, _connection);

            if (parameters != null)
            {
                foreach (var param in parameters)
                {
                    _command.Parameters.AddWithValue(param.Key, param.Value);
                }
            }


            await _command.ExecuteNonQueryAsync();
        }