Delete a Data Source (ODBC)
You can delete a data source by using ODBC Administrator, programmatically (by using SQLConfigDataSource), or by deleting a file (if a file data source name).
To delete a data source by using ODBC Administrator
In Control Panel, open Administrative Tools, and then double-click Data Sources (ODBC). Alternatively, you can run odbcad32.exe from the command prompt.
Click the User DSN, System DSN, or File DSN tab.
Click the data source to delete.
Click Remove, and then confirm the deletion.
Example
To programmatically delete a data source, call SQLConfigDataSource using either ODBC_REMOVE_DSN or ODBC_REMOVE_SYS_DSN as the second parameter.
The following sample shows how you can programmatically delete a data source.
// remove_odbc_data_source.cpp
// compile with: ODBCCP32.lib user32.lib
#include <iostream>
#include <windows.h>
#include <odbcinst.h>
int main() {
LPCSTR provider = "SQL Server"; // Windows SQL Server Driver
LPCSTR provider = "SQL Server"; // Windows SQL Server driver
LPCSTR provider2 = "SQL Server Native Client 11.0"; // SQL Server 2012 Native Client driver
LPCSTR dsnname = "DSN=data2";
BOOL retval = SQLConfigDataSource(NULL, ODBC_REMOVE_DSN, provider, dsnname);
std::cout << retval; // 1 if successful
}