Thread: SQL Exception ( declaring a variable )

  1. #1
    Registered User Aga^^'s Avatar
    Join Date
    Aug 2008

    Unhappy SQL Exception ( declaring a variable )

    hi guys , i am doing a add book form of an admin panel in library automation at ASP.NET (C#).
    I have a problem at declaring a variable , when i built the project there is no error or warning but when i run and clicked the add button the error comes.
    the code is below

    protected void btnInsert_Click(object sender, EventArgs e)
            SqlConnection con = dbConnection.GetConnection();
            SqlCommand command = new SqlCommand("select b_name from books where b_name=@name", con);
            command.Parameters.AddWithValue("@name", txtBook.Text);
            SqlDataReader rdr = command.ExecuteReader();
            if (rdr.Read())
                ltrlInf.Text = "";
                ltrlInf.Text += "This book has been added before";
                SqlCommand cmd2 = new SqlCommand("select c_id from categories where c_name=@catname", con);
                cmd2.Parameters.AddWithValue("@catname", ddlCat.SelectedValue.ToString());
                SqlDataReader rdr2 = cmd2.ExecuteReader();
                while (rdr2.Read())
                    i = Int32.Parse(rdr2.GetValue(0).ToString());
                SqlCommand cmd = new SqlCommand("insert into books (b_name,b_author,b_lang,b_page,c_id,b_stock,b_year,b_thumbnail,s_id) VALUES (@name,@author,@lang,@page,@cid@,@stock,@year,@thumbnail,@sid)", con);
                cmd.Parameters.AddWithValue("@name", txtBook.Text);
                cmd.Parameters.AddWithValue("@author", txtAuthor.Text);
                cmd.Parameters.AddWithValue("@lang", txtLang.Text);
                cmd.Parameters.AddWithValue("@page", txtPage.Text);
                cmd.Parameters.AddWithValue("@stock", txtStock.Text);
                cmd.Parameters.AddWithValue("@year", txtYear.Text);
                cmd.Parameters.AddWithValue("@thumbnail", ".\\" + "thumbs" + "\\" + FileUpload1.FileName);
                cmd.Parameters.AddWithValue("@sid", ddlScat.SelectedValue.ToString());
                cmd.ExecuteNonQuery(); //ERROR COMES HERE ( Must declare the scalar variable "@cid@". )           
                ltrlInf.Text += "The book has been added";
    i am waiting your answers...

  2. #2
    &TH of undefined behavior Fordy's Avatar
    Join Date
    Aug 2001
    Havent run your code but dont you thing that "@cid@" is different from "@cid"?

    Look at your sql

  3. #3
    Registered User Aga^^'s Avatar
    Join Date
    Aug 2008
    upsss i am sleepy and tired.
    Thanks a lot Fordy

  4. #4
    Registered User
    Join Date
    Jul 2009
    wow dats hard to me (((blurrr)))

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