File Upload data getting cleared after a textbox changed event fired

Hello Sandeep,

you can use the update panel below and handle partial postback,

Servcer side as below,

protected void Button1_Click(object sender, EventArgs e)
{
    if (FileUpload1.HasFile)
    {
        string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
        FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Uploads/") + fileName);
        // Additional logic for handling the uploaded file
    }
}

protected void txtBasicValueGst18Per_TextChanged(object sender, EventArgs e)
{
    // Handle text changed event
}

Can i do this using Update Pannel id yes thn how

When a postback occurs due to the TextChanged event of the txtBasicValueGst18Per TextBox, the entire page lifecycle is executed again, which includes re-rendering the page controls and resetting their values to their original states.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // Check if file data is stored in session state
        if (Session["FileData"] != null)
        {
            // Retrieve file data from session state and reassign it to FileUpload control
            var fileData = (FileData)Session["FileData"];
            fuquationFile1.FileName = fileData.FileName;
            // Assign other file data properties as needed
        }
    }
}

protected void txtBasicValueGst18Per_TextChanged(object sender, EventArgs e)
{
    // Your event handler logic here
    
    // Store file data in session state
    var fileData = new FileData
    {
        FileName = fuquationFile1.FileName,
        // Set other file data properties as needed
    };
    Session["FileData"] = fileData;
}

// Define a class to represent file data
public class FileData
{
    public string FileName { get; set; }
    // Add other file data properties as needed
}

Simple I have Web form page (
aspx)   In Existing Page I have added file upload control where there were  many textbox  changedevent  and dropdown onselectindexchanged event fired but when Fileupload attaching a file then file getting cleared when textchanged event fired

Please Help m,e

It seems like you might be using .NET WebForms. Could you provide the fileName.aspx.cs file?

Any One help me