C#

private void GetServerDatabases(TreeView tree, string sqlServerInctance)
        {
            // clear current nodes
            tree.Nodes.Clear();

            // create a server object to interact with sql server inctance
            Microsoft.SqlServer.Management.Smo.Server server = new Microsoft.SqlServer.Management.Smo.Server(sqlServerInctance);

            // iterate through each database which exist in server object
            foreach (Microsoft.SqlServer.Management.Smo.Database db in server.Databases)
            {
                // create a node to hold database (main node or level 0)
                TreeNode dbNode = new TreeNode(db.Name);

                // create a node named 'Tables' to hold tables for each database (level 1)
                TreeNode tablesNode = new TreeNode("Tables");

                // create a node named 'Stored Procedures' to hold storedProcedures for each database (level 1)
                TreeNode spsNode = new TreeNode("Stored Procedures");

                // add Tabales and StoredProcedures node as child to database node
                dbNode.Nodes.Add(tablesNode);
                dbNode.Nodes.Add(spsNode);



                // add db node to treeView                
                tree.Invoke(delegate
                {
                    tree.Nodes.Add(dbNode);
                });
            }            
        }