Question

I am developing a project in ASP.NET with c# and SQL Server 2005 as back end. It includes a page profile.aspx which displays the information of a user from database. The session variable is used to keep track of the current logged in user.

The profiles table in the database contains a username column and 10 others columns like dept, address, contact, skills, interests etc etc.

I am displaying all these values on profile.aspx. Another page is edit_profile.aspx which comes up when the edit button on profile.aspx is clicked. Here the data is displayed in textboxes, with older entries already displayed, which can be edited, and click the Update button to confirm.

The update query runs fine, there is no error, but the values are not updates in the database tables. What is the possible reason? Solution?

Thank you

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protected void Page_Load(object sender, EventArgs e)
{
    string CNS = ConfigurationManager.ConnectionStrings["myconn"].ToString();
    SqlConnection con = new SqlConnection(@CNS);
    SqlDataAdapter sda = new SqlDataAdapter("select * from profiles where username='" +     Session["currentusername"].ToString()+"'", con);
    DataSet ds = new DataSet();
    sda.Fill(ds, "profiles");
    txt_name.Text = ds.Tables["profiles"].Rows[0][0].ToString();
    txt_deptt.Text = ds.Tables["profiles"].Rows[0][1].ToString();
    txt_qualificatns.Text = ds.Tables["profiles"].Rows[0][2].ToString();
    txt_add.Text = ds.Tables["profiles"].Rows[0][3].ToString();
    txt_contacts.Text = ds.Tables["profiles"].Rows[0][4].ToString();
    txt_interests.Text = ds.Tables["profiles"].Rows[0][5].ToString();
    txt_awards.Text = ds.Tables["profiles"].Rows[0][6].ToString();
    txt_website.Text = ds.Tables["profiles"].Rows[0][7].ToString();
    txt_skills.Text = ds.Tables["profiles"].Rows[0][8].ToString();
    txt_mstatus.Text = ds.Tables["profiles"].Rows[0][9].ToString();
    ds.Reset();
}



protected void Button1_Click(object sender, EventArgs e)
{
    string CNS = ConfigurationManager.ConnectionStrings["myconn"].ToString();
    SqlConnection con = new SqlConnection(@CNS);
    SqlCommand sda = new SqlCommand("update profiles set department='"+txt_deptt.Text+"',qualifications='"+txt_qualificatns.Text+"', address='"+txt_add.Text+"', contacts='"+txt_contacts.Text+"', interests='"+txt_interests.Text+"', awards='"+txt_awards.Text+"', website='"+txt_website.Text+"', skills='"+txt_skills.Text+"', mstatus='"+txt_mstatus.Text+"' where username='" + Session["currentusername"].ToString() + "'", con);
    DataSet ds = new DataSet();
    try
    {
        con.Open();
        int temp=sda.ExecuteNonQuery();
        con.Close();
        if (temp >= 1)
        {
            lbl_message.ForeColor = System.Drawing.Color.Green;
            lbl_message.Text = "Profile Updated Successfully!";
        }
        else
        {
            lbl_message.ForeColor = System.Drawing.Color.Red;
            lbl_message.Text = "Integer less than 1";
        }

    }
    catch
    {
        lbl_message.ForeColor = System.Drawing.Color.Red;
        lbl_message.Text = "Try Again Later, An Error Occured!";
    }
    //Response.Redirect("profile.aspx");
}

}

Answer 1

You are overwriting the contents of your textboxes every time the page loads so the user inputted conntet is never written to the database…

Look at the Page.IsPostBack method. Basically, wrap the commands to fill the textboxes with

if (!Page.IsPostBack) {}

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To only load the values into the text box the first time the page loads (and so not overwrite the user entered values when you click the button you need to check that the page isn’t a post back.

I think maybe a book on basic ASP.Net will help answer many questions you may have early on.

protected void Page_Load(object sender, EventArgs e)
{
 if (!Page.IsPostBack) {
    string CNS = ConfigurationManager.ConnectionStrings["myconn"].ToString();
    SqlConnection con = new SqlConnection(@CNS);
    SqlDataAdapter sda = new SqlDataAdapter("select * from profiles where username='" +     Session["currentusername"].ToString()+"'", con);
    DataSet ds = new DataSet();
    sda.Fill(ds, "profiles");
    txt_name.Text = ds.Tables["profiles"].Rows[0][0].ToString();
    txt_deptt.Text = ds.Tables["profiles"].Rows[0][1].ToString();
    txt_qualificatns.Text = ds.Tables["profiles"].Rows[0][2].ToString();
    txt_add.Text = ds.Tables["profiles"].Rows[0][3].ToString();
    txt_contacts.Text = ds.Tables["profiles"].Rows[0][4].ToString();
    txt_interests.Text = ds.Tables["profiles"].Rows[0][5].ToString();
    txt_awards.Text = ds.Tables["profiles"].Rows[0][6].ToString();
    txt_website.Text = ds.Tables["profiles"].Rows[0][7].ToString();
    txt_skills.Text = ds.Tables["profiles"].Rows[0][8].ToString();
    txt_mstatus.Text = ds.Tables["profiles"].Rows[0][9].ToString();
    ds.Reset();
}
}