How to Validate parameter in asp.net core 3.0 web api's get request?

Question

I want to validate the parameter in  web api's get request. How to achieve this.

 

code:

 

[HttpGet("{id}")]
public async Task<ActionResult<Schedd>> GetSchedd(string id)
{
    return Ok(await _context.Schedds.FromSqlRaw<Schedd>("sp_userprofile {0},{1},{2}", id, 7, null).ToListAsync());
}

 

Here String id must not contain any symbol or alphapet.