Here is the sample JavaScript code to demonstrate that how can we validate a checkbox list inside the aspx page. Just call function vldChkBoxlist() and it will validate your checkbox list.

function vldChkBoxlist()
{
var tableBody = document.getElementById(‘CheckBoxList1’).childNodes[0];
for (var i=0;i<tableBody.childNodes.length; i++)
{
var currentTd = tableBody.childNodes[i].childNodes[0];
var listControl = currentTd.childNodes[0];
if (listControl.checked =true)
{
listControl.checked = false;
}
return false;
}

Creating images in .Net is not a big task.This can be done using a bitmap object & graphics object. Using thease objcts we can create our own images or any graphicle objects.

Public Void CreateImage()
{
System.Drawing.Bitmap objBMP = new System.Drawing.Bitmap(1500, 600);
 
System.Drawing.Graphics objGraph = System.Drawing.Graphics.FromImage(objBMP);
objGraph.Clear(System.Drawing.Color.Gray);
objGraph.DrawString("Hello Anil.", new System.Drawing.Font("Courier", 10), Brushes.Green, 70, 90);
objBMP.Save("D:\\Anil\\Sample.bmp", System.Drawing.Imaging.ImageFormat.Bmp); //Please provide your path here tp save the image
}