mysql connection in visual c++

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C++

MySQL

connection

, +

string^ constring=L"datasource=localhost;port:80;username=root;password='';";
MySqlConnection^ conDatabase=gcnew MySqlConnection(constring);
MySqlCommand^ cmd=gcnew MySqlCommand("select * from eventor.user",conDatabase);
MySqlDataReader^ myreader;
try
{
conDatabase->Open();
myreader=cmd->ExecuteReader();
}
 catch(Exception^ ex)
{
 MessageBox::Show(ex->Message);
 }

there is a problem in th constring and string

1>c:\users\sony\documents\visual studio 2010\projects\student database\student database\Form1.h(134): error C2065: 'string' : undeclared identifier
1>c:\users\sony\documents\visual studio 2010\projects\student database\student database\Form1.h(134): error C2065: 'constring' : undeclared identifier
1>c:\users\sony\documents\visual studio 2010\projects\student database\student database\Form1.h(135): error C2065: 'constring' : undeclared identifier


help me