asp.Net配列に値があるか否かを判断する方法

 
  
string str1 = "0,1,2,3,4,5,6 "; 
  
string[] str = str1.Split( ', '); 
  
bool hasFlag=false; 
  
foreach (string a in str) 
  
{ 
  
if (a == "7 ") 
  
{ 
  
hasFlag=true; 
  
break; 
  
} 
  
} 
  
if(hasFlag) 
  
{ //      } 
  
else 
  
{ //   } 
  
 
 

 
  
string [] flag = adminuser.Flag.Split('/'); 
  
List list = new List(flag); 
  
if (list.Contains("9")) 
  
Response.Write("      "+adminuser.UserName.ToString()); 
  
else 
  
Response.Write("alert('          ');location.href='admin_main.aspx'");