C# - Verfügbare SQL-Server abfragen

            DataTable dataTable = System.Data.Sql.SqlDataSourceEnumerator.Instance.GetDataSources();

            foreach (DataRow datarow in dataTable.Rows)
            {
                string datasource = datarow["ServerName"].ToString();
                if (datarow["InstanceName"] != DBNull.Value)
                {
                    datasource += String.Format("\\{0}", datarow["InstanceName"]);

                    ComboBox1.Items.Add(datasource);
                }

                DataGridView1.DataSource = dataTable;
            }