validate base64 string c#

The solution for this is noted below

validate base64 string c#

Solution

public static bool IsBase64String(string base64)
{
   Span<byte> buffer = new Span<byte>(new byte[base64.Length]);
   return Convert.TryFromBase64String(base64, buffer , out int bytesParsed);
}

Try other methods by searching on the site. That is if this doesn’t work