1
Answer

DataGrid ClientSideEvents

william 0

william 0
20y
2.1k
1
Sushila D. Patel - I converted the VB code snippet below to C# as seen in your article: http://www.c-sharpcorner.com/Code/2003/June/DataGridClientSideEvents.asp. It seemed to have worked okay except for the bad line below... This is the bad line: dv = dgContactHistory.DataSource; 'Cannot implicitly convert type 'object' to 'System.Data.DataView' dgContactHistory is a datagrid on my web form. The VB code seems to make this assignment without issue; I thought it would work in C#. I have tried to type-cast this line and it compiles, but the application doesn't like the (DataView) type-cast. Could anyone offer a suggestion? Thank you very much. William C# private void dgContactHistory_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { string strID; DataView dv; DataColumnCollection dc; dv = dgContactHistory.DataSource; dc = dv.Table.Columns; foreach (DataColumn dcCol in dv.Table.Columns) { if ((e.Item.ItemType == ListItemType.AlternatingItem) || (e.Item.ItemType == ListItemType.Item)) { strID = dgContactHistory.DataKeys[e.Item.ItemIndex].ToString(); e.Item.Attributes.Add("onmouseover", "this.style.backgroundColor='#99ccff'"); ... VB Private Sub DataGrid1_ItemDataBound(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemDataBound Dim dv As DataView = DataGrid1.DataSource Dim dcCol As DataColumn Dim dc As DataColumnCollection = dv.Table.Columns Dim strID As String For Each dcCol In dv.Table.Columns If e.Item.ItemType = ListItemType.AlternatingItem Or _ e.Item.ItemType = ListItemType.Item Then strID = DataGrid1.DataKeys(e.Item.ItemIndex) e.Item.Attributes.Add("onmouseover", "this.style.backgroundColor='#99ccff'")
Answers (1)
0
Emily Foster

Emily Foster

758 875 0 Feb 25

To insert a digital signature using a digital certificate at runtime into a PDF without user intervention, you can utilize a programming language like Java along with libraries that support digital signatures like Bouncy Castle or iText. Here's a high-level overview of the process:

1. Load the PDF document that you want to sign.

2. Load the digital certificate from the ".pfx" file using the provided password.

3. Create a digital signature with the certificate's private key.

4. Add the digital signature to each page of the PDF document.

Below is a simplified example using Java and the iText library to demonstrate how you can digitally sign a PDF at runtime:


import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;

public class DigitalSignatureExample {
    public static void main(String[] args) {
        try {
            String pdfFilePath = "path/to/input.pdf";
            String outputPdfFilePath = "path/to/output.pdf";
            String pfxFilePath = "path/to/ANY NAME.PFX";
            String password = "PASSWORD";

            KeyStore ks = KeyStore.getInstance("PKCS12");
            ks.load(new FileInputStream(pfxFilePath), password.toCharArray());

            String alias = (String) ks.aliases().nextElement();
            PrivateKey privateKey = (PrivateKey) ks.getKey(alias, password.toCharArray());
            Certificate[] chain = ks.getCertificateChain(alias);

            PdfReader reader = new PdfReader(pdfFilePath);
            PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputPdfFilePath));
            PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
            
            appearance.setCertificate(chain[0]);
            appearance.setReason("Digitally signed by me");
            appearance.setLocation("Location");
            appearance.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, "signature");

            appearance.setCrypto(privateKey, chain, null, PdfSignatureAppearance.SELF_SIGNED);

            stamper.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Remember to handle exceptions, manage resources properly, and customize the signature appearance as needed. This code snippet provides a basic structure for adding a digital signature at runtime to a PDF file using a digital certificate stored in a ".pfx" file.

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