i wat to clear existing Response.Header and add a new header.

error occurred with  "Response.ClearHeaders(); " 

protected void Button_Click(object sender, EventArgs e)
{
    // Call the first method for downloading Excel file
    DownloadExcelFile();

    // Clear the headers after the first method
    Response.ClearHeaders();
    Response.ClearContent();
    Response.Clear();

    // Call the second method for downloading Text file
    DownloadTextFile();
}

private void DownloadExcelFile()
{
    // Code to generate and download Excel file
    // For example:
    Response.AddHeader("Content-Disposition", "attachment; filename=excel_file.xlsx");
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    // ... write Excel file content to Response.OutputStream ...
    Response.Flush();
    Response.End();
}

private void DownloadTextFile()
{
    // Code to generate and download Text file
    // For example:
    Response.AddHeader("Content-Disposition", "attachment; filename=text_file.txt");
    Response.ContentType = "text/plain";
    // ... write Text file content to Response.OutputStream ...
    Response.Flush();
    Response.End();
}

0

protected void btnDownloadExcel_Click(object sender, EventArgs e)
{
    // Set Excel-specific response headers
    Response.Clear();
    Response.AddHeader("content-disposition", "attachment; filename=excel_file.xlsx");
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

    // Call method to generate Excel content and write to Response.OutputStream
    GenerateExcelContent();
    
    // End the response
    Response.End();
}

protected void btnDownloadText_Click(object sender, EventArgs e)
{
    // Set Text-specific response headers
    Response.Clear();
    Response.AddHeader("content-disposition", "attachment; filename=text_file.txt");
    Response.ContentType = "text/plain";

    // Call method to generate Text content and write to Response.OutputStream
    GenerateTextContent();
    
    // End the response
    Response.End();
}

let me know if it is helpful & accept the answer

protected void Button_Click(object sender, EventArgs e)
{
    // Method 1: Download Excel File
    // Set appropriate headers for Excel file download
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    Response.AddHeader("Content-Disposition", "attachment; filename=ExcelFile.xlsx");
    // ... your code to generate Excel content ...

    // After the first method, clear headers
    Response.ClearHeaders();
    Response.Clear();

    // Method 2: Download Text File
    // Set appropriate headers for text file download
    Response.ContentType = "text/plain";
    Response.AddHeader("Content-Disposition", "attachment; filename=TextFile.txt");
    // ... your code to generate text content ...
    
    // No need to clear headers after the second method since you're done with the response.
}

Response.ClearHeaders() and Response.Clear() to remove the headers set for the Excel download. This will essentially "reset" the response headers to their default state before you set the headers for the text file download in the second method.

To clear the Response Headers after executing the first method, you can try the following approach:

1. Before executing the first method, save the current Response Headers in a variable.
2. After executing the first method, clear the Response Headers using the Response.ClearHeaders() method.
3. Set the saved Response Headers back to the Response using the Response.Headers property.

Here is an example code snippet:

protected void YourButtonClickEvent(object sender, EventArgs e)
{
    // Save the current Response Headers
    var savedHeaders = Response.Headers;

    // Execute the first method to download excel file
    DownloadToExcel();

    // Clear the Response Headers
    Response.ClearHeaders();

    // Set the saved Headers back to the Response
    Response.Headers = savedHeaders;

    // Execute the second method to download text file
    DownloadToText();
}