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Displaying image in ASP.NET C#
var kpin = Base64ToImage(TextBox1.Text);
kpin.Save(@"e:myim.png");
Image1.ImageUrl = @"e:myim.png";

public Image Base64ToImage(string base64String)
{
    byte[] imageBytes = Convert.FromBase64String(base64String);
    MemoryStream ms = new MemoryStream(imageBytes, 0,
      imageBytes.Length);
    ms.Write(imageBytes, 0, imageBytes.Length);
    Image image = Image.FromStream(ms, true);
    return image;
}

public void Base64ToResponse(string base64String)
{
    Response.ContentType = "text/png"; //or whatever...
    byte[] imageBytes = Convert.FromBase64String(base64String);
    Response.OutputStream(imageBytes, 0, imageBytes.Length);
}