Application call to ODBC SQLSetEnvAttr function throw HY011 exception

Hi All,
I try to use odbc driver manager in my .Net Application.first My .Net runtime is 3.5, odbc function calls(unmanaged functions are imported to .Net application by dllimport attribute)can work well.but when .Net runtime is upgraded
to 4.0,SetEnvAttr function calls
return SQL-ERROR and I call SQLGetDiagRec function get this error information:Operation invalid at this time.sqlstate value is HY011.
below is my code fragment:
[DllImport("odbc32.dll")]
extern static short SQLSetEnvAttr(
IntPtr envHandle,
ushort attribute,
IntPtr attrValue,
int stringLength);
[DllImport("odbc32.dll")]
extern static short SQLAllocHandle(
ushort HandleType,
int InputHandle,
out IntPtr OutputHandle);
try
rc = SQLAllocHandle(SQL_HANDLE_ENV, 0, out sql_env_handle);
if ((rc != SQL_SUCCESS) && (rc != SQL_SUCCESS_WITH_INFO))
throw new Exception("SQLAllocHandle: failed to allocate SQL_HANDLE_ENV");
rc = SQLSetEnvAttr(sql_env_handle, SQL_ATTR_ODBC_VERSION, (IntPtr)SQL_OV_ODBC3, 0);
//if ((rc != SQL_SUCCESS) && (rc != SQL_SUCCESS_WITH_INFO))
// throw new Exception("SQLSetEnvAttr: failed to set SQL_ATTR_ODBC_VERSION");
if((rc == SQL_SUCCESS_WITH_INFO)||(rc == SQL_ERROR))
short i=1;
short rc2;
StringBuilder sqlstate=new StringBuilder();
int NativeErrorPtr=0;
StringBuilder MessageText=new StringBuilder();
short BufferLength=256;
short TextLengthPtr=0;
while ((rc2 = SQLGetDiagRec((short)SQL_HANDLE_ENV,sql_env_handle,i,sqlstate,
ref NativeErrorPtr,MessageText,BufferLength,ref TextLengthPtr))!= SQL_NO_DATA)
i++;
my operation system is win7 64bit. Could someone help me? thanks

I already fixed this problem.
[DllImport("odbc32.dll")]
extern static short SQLAllocHandle(
long HandleType,
int InputHandle,
out IntPtr OutputHandle);
I replace ushort datatype with long datatype.So it works well

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Posts: 108
From: Gainesville, FL
Registered: 1/24/02
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sspadafo
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