On Button Click How Open A page in new window in asp.net - c# code

Task: Open a new window using c# code in asp.net website/web application. 

Description: The problem is this we can use Response.Redirect() method for redirect/open  new webpage in same window, But how we can open a new page in new window.

So that I use javascript code(alert box) for popup new window in c# code behind file as describe below. I write below code on Button Click Event.

// Dynamic Alert box javascript using c# code in asp.net

 protected void btngeneraterecipt_Click(object sender, EventArgs e)
    {
        try
        {
            string queryString = "billformat.aspx";
            string jquery = "window.open('" + queryString + "');";
            ScriptManager.RegisterStartupScript(this,this.GetType(), "pop", jquery, true);
        }
        catch (Exception ee)
        {
            Label1.Text = ee.Message;
        }
    }

Image Upload & Resize in asp.net with c#.net

         Image Upload & Resize in asp.net

Task: Upload Image & Resize it proportionally.

Description: Now days we require upload product images in a E-Commerce Website & we want to resize it also. So we can resize image when uploaded by using admin panel.

Here I use below code to resize image with its proportionally. So it will not stretch. This code is useful for jpg and png images.

using System.Drawing;
 protected void button_upload_image(object sender, EventArgs e)
    {
       if (FileUpload1.PostedFile.ContentLength != 0)
       {
           string temp = Server.MapPath(@"images\");
           string path = temp + "hemant.jpg";
           temp = temp + "temp.jpg";
           FileUpload1.SaveAs(temp);
           setimagesize(temp, path, 800, 600,400,300);
        } 
    }



// Call this function for resizing ( compress height and width proportionally )
// destination and imagepath must be differ
 protected void setimagesize(string imagepath, string destination, int maxwidth, int maxheight,int minwid,int minhight)
    {
        string path = imagepath.ToString();
        string dest = destination.ToString();

        System.Drawing.Image img1 = System.Drawing.Image.FromFile(path); // source of large image
        int owd = Convert.ToInt32(img1.Width);
        int oht = Convert.ToInt32(img1.Height);
        //       Compress Large Image Height/Width to according our canvas max(800*600)
        int nwd, nht;
        nwd = owd;
        nht = oht;
        if (owd > oht)
        {
            if (owd > maxwidth)                                // For Maximum width
            {
                nwd = maxwidth;
                nht = oht * maxwidth / owd;
            }
            else if (owd < minwid)                      // For minimum width
            {
                nwd = minwid;
                nht = oht * minwid / owd;
            }
        }
        else
        {
            if (oht > maxheight)                                // For Maximum height
            {
                nht = maxheight;
                nwd = owd * maxheight / oht;
            }
            else if (oht < minhight)                    //  For Minimum width
            {
                nht = minhight;
                nwd = owd * minhight / oht;
            }
        }

        ///////////////////////////
        //     Saving Compress Image
        ///////////////////////////////////////
        Bitmap bmp = new Bitmap(nwd, nht);
        System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
        gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.Default;
        gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.Default;
        gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;
        System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, nwd, nht);
        gr.DrawImage(img1, rectDestination, 0, 0, owd, oht, GraphicsUnit.Pixel);
        bmp.Save(dest, img1.RawFormat); //image size reduce by using this code changing by    
        bmp.Save(dest);
        bmp.Dispose();
       gr.Dispose();
        img1.Dispose();

    }