How to save image into folder or directory

string folderPath = Server.MapPath("~/ImagesFolder/");  //Create a Folder in your Root directory on your solution.
string fileName = "IMageName.jpg";
string imagePath = folderPath + fileName;

string base64StringData = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAlgAAADmCAYAAAA..........."; // Your base 64 string data
string cleandata = base64StringData.Replace("data:image/png;base64,", "");
byte[] data = System.Convert.FromBase64String(cleandata);
MemoryStream ms = new MemoryStream(data);
System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
img.Save(imagePath, System.Drawing.Imaging.ImageFormat.Jpeg);