Error in CLR Project

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C#3.0

C#

Hi guys.
I have a problem in a clr projects.
i create a clr project in C#.net 3.0(following code).

public partial class UserDefinedFunctions
{
    [Microsoft.SqlServer.Server.SqlFunction]
    public static SqlString CLR_GET_SCHEMA(string tablename,int i)
    {
        // Put your code here
        List<string> strlist=new List<string>();
        SqlConnection connectionstring = new System.Data.SqlClient.SqlConnection("server=localhost;database=S7;Integrated Security=true");
        SqlCommand selectcommand = new System.Data.SqlClient.SqlCommand();
        selectcommand.Connection = connectionstring;
        selectcommand.CommandText = "USP_SCHEMA";
        selectcommand.CommandType = CommandType.StoredProcedure;
        selectcommand.Parameters.Add("@TABLENAME", SqlDbType.VarChar, 50);
        selectcommand.Parameters["@TABLENAME"].Value = tablename;
        connectionstring.Open();
        SqlDataReader reader=selectcommand.ExecuteReader() ;
        while (reader.Read())
        {
            strlist.Add(Convert.ToString(reader[0]));
        }
        return strlist[i];

    }
};

When i deploy my project The project have successful build
but when i use the function in management studio i have the following error.

Quote:

Msg 6522, Level 16, State 2, Line 2
A .NET Framework error occurred during execution of user-defined routine or aggregate "CLR_GET_SCHEMA":
System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
System.Security.SecurityException:
at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
at System.Security.PermissionSet.Demand()
at System.Data.Common.DbConnectionOptions.DemandPermission()
at System.Data.SqlClient.SqlConnection.PermissionDemand()
at System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection)
at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
at System.Data.SqlClient.SqlConnection.Open()
at UserDefinedFunctions.CLR_GET_SCHEMA(String tablename, Int32 i)

My stored prodedure

USE AdventureWorks
GO
ALTER PROC USP_SCHEMA
   @TABLENAME VARCHAR(50)
AS
BEGIN
   SELECT TABLE_SCHEMA 
   FROM INFORMATION_SCHEMA.TABLES
   WHERE TABLE_NAME=@TABLENAME
END   
GO 
EXEC USP_SCHEMA 'PRODUCT'

please help me