how to print all qr code in one BtnPrint event

Question

I want to print all QR Code which is bind in gridview , i want to clich click a button and print all QR Code In Once click. The below image is gridview data bind in asp.net

Deepak Rawat · Answer

here is code you can try: protected void PrintButton_Click(object sender, EventArgs e) { foreach (GridViewRow row in YourGridView.Rows) { // Access data associated with each row string qrCodeData = row.Cells[0].Text; // Assuming QR Code data is in the first column // Generate QR Code for each row's data Bitmap qrCodeImage = GenerateQRCode(qrCodeData); // Use your QR Code generator function // Print the QR Code image PrintQRCode(qrCodeImage); // Implement the printing logic // Dispose the QR Code image to free resources qrCodeImage.Dispose(); } }

Amit Mohanty · Answer

Use this Bitmap qrCodeImage = new Bitmap(200, 200);

Rajkiran Swain · Answer

private void BtnPrint_Click(object sender, EventArgs e) { // Create a bitmap to hold all QR codes int qrCodeWidth = 200; // Width of each QR code int qrCodeHeight = 200; // Height of each QR code int spacing = 10; // Spacing between QR codes int rowCount = GridView1.Rows.Count; // Number of rows in the GridView int columnCount = 4; // Number of QR codes to be displayed in each row (adjust as needed) int totalWidth = columnCount * qrCodeWidth + (columnCount - 1) * spacing; int totalHeight = ((rowCount - 1) / columnCount + 1) * qrCodeHeight + ((rowCount - 1) / columnCount) * spacing; Bitmap combinedImage = new Bitmap(totalWidth, totalHeight); // Retrieve data from the GridView and generate QR codes using (Graphics graphics = Graphics.FromImage(combinedImage)) { int x = 0; int y = 0; int counter = 0; foreach (GridViewRow row in GridView1.Rows) { // Get the data for each row (e.g., QR code value) string qrCodeValue = row.Cells[1].Text; // Use the correct column index // Generate QR code image BarcodeWriter barcodeWriter = new BarcodeWriter(); barcodeWriter.Format = BarcodeFormat.QR_CODE; barcodeWriter.Options = new ZXing.Common.EncodingOptions { Width = qrCodeWidth, Height = qrCodeHeight }; Bitmap qrCodeImage = barcodeWriter.Write(qrCodeValue); // Draw the QR code image on the combined image graphics.DrawImage(qrCodeImage, new Rectangle(x, y, qrCodeWidth, qrCodeHeight)); // Move to the next position x += qrCodeWidth + spacing; counter++; // Move to the next row if necessary if (counter % columnCount == 0) { x = 0; y += qrCodeHeight + spacing; } } } // Print the combined QR code image PrintDocument printDoc = new PrintDocument(); printDoc.PrintPage += (s, args) => { args.Graphics.DrawImage(combinedImage, args.MarginBounds); args.HasMorePages = false; }; printDoc.Print(); }

Sandeep Kumar · Answer

This line error showing Bitmap qrCodeImage = new Bitmap(placeholderQRCode.Width, placeholderQRCode.Height);

Amit Mohanty · Answer

For Placeholder control: private List GetQRCodeImages() { List qrCodeImages = new List (); foreach (GridViewRow row in GridView1.Rows) { Placeholder placeholderQRCode = (Placeholder)row.FindControl("placeholderQRCode"); // Create a bitmap object and draw the contents of the placeholder onto it Bitmap qrCodeImage = new Bitmap(placeholderQRCode.Width, placeholderQRCode.Height); placeholderQRCode.RenderControl(new HtmlTextWriter(new StringWriter())); using (Graphics graphics = Graphics.FromImage(qrCodeImage)) { IntPtr hdc = graphics.GetHdc(); placeholderQRCode.RenderControl(new HtmlTextWriter(new HtmlTextWriter(new IntPtr(hdc)))); graphics.ReleaseHdc(hdc); } qrCodeImages.Add(qrCodeImage); } return qrCodeImages; }

Sandeep Kumar · Answer

i am using PlaceHolder control in place of Image in gridview ItemTemplate

Amit Mohanty · Answer

Try this protected void btnPrint_Click(object sender, EventArgs e) { List qrCodeImages = GetQRCodeImages(); // Function to retrieve QR code images from gridview int numColumns = 4; // Number of columns in the layout int numRows = (int)Math.Ceiling((double)qrCodeImages.Count / numColumns); // Number of rows in the layout int qrCodeWidth = 200; // Width of each QR code image int qrCodeHeight = 200; // Height of each QR code image int combinedImageWidth = qrCodeWidth * numColumns; // Width of the combined image int combinedImageHeight = qrCodeHeight * numRows; // Height of the combined image Bitmap combinedImage = new Bitmap(combinedImageWidth, combinedImageHeight); using (Graphics g = Graphics.FromImage(combinedImage)) { for (int i = 0; i { args.Graphics.DrawImage(combinedImage, new Point(0, 0)); }; pd.Print(); } private List GetQRCodeImages() { List qrCodeImages = new List (); foreach (GridViewRow row in GridView1.Rows) { Image imgQRCode = (Image)row.FindControl("imgQRCode"); // Convert the Image control to a Bitmap object Bitmap qrCodeImage = new Bitmap(imgQRCode.Image); qrCodeImages.Add(qrCodeImage); } return qrCodeImages; }

Sandeep Kumar · Answer

All Qr Code should be in one page

Amit Mohanty · Answer

Check this protected void btnPrint_Click(object sender, EventArgs e) { // Loop through all rows in the gridview for (int i = 0; i { args.Graphics.DrawImage(imgQRCode.Image, new Point(0, 0)); }; pd.Print(); } }

Sandeep Kumar · Answer

row.Cells[1].Text; // Use the correct column index i used this but still it has ""(blank) value

Rajkiran Swain · Answer

private void BtnPrint_Click(object sender, EventArgs e) { // Retrieve data from the gridview foreach (GridViewRow row in GridView1.Rows) { // Get the data for each row (e.g., QR code value) string qrCodeValue = row.Cells[1].Text; // Use the correct column index // Generate QR code image BarcodeWriter barcodeWriter = new BarcodeWriter(); barcodeWriter.Format = BarcodeFormat.QR_CODE; barcodeWriter.Options = new ZXing.Common.EncodingOptions { Width = 200, Height = 200 }; Bitmap qrCodeImage = barcodeWriter.Write(qrCodeValue); // Print the QR code image PrintDocument printDoc = new PrintDocument(); printDoc.PrintPage += (s, args) => { args.Graphics.DrawImage(qrCodeImage, args.MarginBounds); args.HasMorePages = false; }; printDoc.Print(); } }

Sandeep Kumar · Answer

Always Showing ""(Blank) thst's why not working string qrCodeValue = row.Cells[0].Text;

Rajkiran Swain · Answer

using System.Drawing.Printing; using ZXing; private void BtnPrint_Click(object sender, EventArgs e) { // Retrieve data from the gridview foreach (GridViewRow row in GridView1.Rows) { // Get the data for each row (e.g., QR code value) string qrCodeValue = row.Cells[0].Text; // Generate QR code image BarcodeWriter barcodeWriter = new BarcodeWriter(); barcodeWriter.Format = BarcodeFormat.QR_CODE; barcodeWriter.Options = new ZXing.Common.EncodingOptions { Width = 200, Height = 200 }; Bitmap qrCodeImage = barcodeWriter.Write(qrCodeValue); // Print the QR code image PrintDocument printDoc = new PrintDocument(); printDoc.PrintPage += (s, args) => { args.Graphics.DrawImage(qrCodeImage, args.MarginBounds); args.HasMorePages = false; }; printDoc.Print(); } }