Question

Why I am getting this error?

Input string was not in a correct format.

I am trying to get data from selected column according to the ID.

Codes are:

protected void Page_Load(object sender, EventArgs e)
{

    SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Connection"].ConnectionString);
    SqlCommand cmd = new SqlCommand("SELECT Date,Day,Time,Total FROM RSVP WHERE Id = @dummy", conn);

    conn.Open();

        cmd.Parameters.Add("@dummy", SqlDbType.Int).Value = Label2.Text;

    var dr = cmd.ExecuteReader();
    if (dr.HasRows == false)
    {
        throw new Exception();
    }
    if (dr.Read())
    {
        Label8.Text = dr[0].ToString();
        Label9.Text = dr[1].ToString();
        Label10.Text = dr[2].ToString();
        Label11.Text = dr[3].ToString();
    }

Error at line

  var dr = cmd.ExecuteReader();

My id is INT data type and it is the PK. Thanks.

Answer 1

Simply Add the value in paramter with AddWithValue in following way:

  cmd.Parameters.AddWithValue("@dummy",  Label2.Text);

There is implicit conversion while working with AddWithValue.