Hash string using MD5 C# .Net 8

Hash using MD5 C# .Net code

public static string Hash_UsingMD5(IDictionary<string, string> stringADict, string partnerKey, out string errMsg)
{
    var sign = "";
    errMsg = string.Empty;
    try
    {
        stringADict.Remove("sign");
        stringADict.Remove("signature");
        StringBuilder builder = new();
        foreach (var item in stringADict.Select(t => t).OrderBy(t => t.Key))
        {
            builder.Append($"{item.Key}={item.Value}&");
        }
        if (!string.IsNullOrEmpty(partnerKey))
        {
            builder.Append($"key={partnerKey}");
        }
        var stringSignTemp =  builder.ToString().TrimEnd('&');
        sign = MD5Encrypt(stringSignTemp, "UTF-8").ToUpper();
    }
    catch (Exception ex)
    {
        errMsg = ex.Message;
    }
    return sign;
}

Summary: