C#

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How do I check for existance or clear the contents of a SharePoint List from C# code?

I have complete the code that creates a sharepoint List from scratch, creates the columns, and loads the data that I get from an API GET query of an external database.

How do I:

	check and see if the SharePoint List already exists
	clear the contents of the sharepoint list
	load the list with new data.

Without doing these steps, I am left with creating the list from scratch each time and giving it a unique name each time.

Is there some source of information on how to do this that I can find online?  The Microsoft AI chat bot has given me some code that does not work at all.

internal static async Task Lock<T>(this T lockObject, Action DoAction) where T : class
{            
    await Task.Run(() => { lock(lockObject)
        {
            DoAction();                    
        }});            
}

public static NativePointer Encode(G711.Ulaw ulaw)
{                        
    if (ulaw == null || !ulaw.ContainsAudio()) throw new Exception(nameof(ulaw));            
    List<byte> bytes = [];
    NativePointer pointer = ulaw._nativePointer!;
    byte[] result = new byte[pointer.Size];
    Marshal.Copy(pointer, result, 0, pointer.Size);
    foreach(byte byt in result)
    {
        bytes.Add(LinearToALawSample(MuLawToLinearSample(byt)));
    }
    
    return new(bytes);
    static byte LinearToALawSample(short pcm_val)
    {          

        int mask;
        int seg;
        byte aval;

        if (pcm_val >= 0)
        {
            mask = 0xD5; // sign (7th) bit = 1
        }
        else
        {                    
            mask = 0x55; // sign bit = 0
            pcm_val = (short)-pcm_val;
            if (pcm_val > EncoderInfo.ALAW_MAX)
            {
                pcm_val = EncoderInfo.ALAW_MAX;
            }
        }

        if (pcm_val < 256)
        {
            aval = (byte)(pcm_val >> 4);

        }
        else
        {
            seg = 1;
            for (int i = pcm_val; i > 256; i >>= 1)
            {
                seg++;
            }
            aval = (byte)((seg << EncoderInfo.SEG_SHIFT) | ((pcm_val >> (seg + 3)) & EncoderInfo.QUANT_MASK));
        }

        return (byte)(((aval & EncoderInfo.SEG_MASK) ^ mask) & EncoderInfo.SIGN_BIT);
    }
    static short MuLawToLinearSample(byte muLaw)
    {                
        int sign = (muLaw & EncoderInfo.SIGN_BIT) >> 7;
        int exponent = (muLaw & EncoderInfo.SEG_MASK) >> 4;
        int mantissa = muLaw & 0x0F;
        int sample = ((mantissa << 3) + EncoderInfo.BIAS) << (exponent + 2);
        return (short)(sign == 0 ? sample : -sample);
    }
}

internal static class EncoderInfo
{
    public const int BIAS = 0x84;
    public const int SEG_MASK = 0x70;
    public const int SIGN_BIT = 0x80;
    public const int ALAW_MAX = 0xFFF;
    public const int QUANT_MASK = 0xF;
    public const int SEG_SHIFT = 4;
}

PaperSize paperSize = new PaperSize("Custom", 400, 200);

PrintDocument pd = new PrintDocument();

                pd.PrinterSettings.PrinterName = "Microsoft Print to PDF";
                pd.PrinterSettings.PrintToFile = true;
                pd.PrinterSettings.PrintFileName = PDF_File_name;

                pd.DefaultPageSettings = Default_PrintProfile_PDF;
                pd.PrinterSettings.DefaultPageSettings.PaperSize = paperSize;

                pd.DefaultPageSettings.PaperSize = paperSize;

                pd.PrintController = new StandardPrintController();

                pd.PrintPage += PrintPage_As_PDF;

                pd.Print();