ExecuteNonQuery: Connection property has not been initialized

[Spectrals]

I have this code and when I run it gives this error ExecuteNonQuery: Connection property has not been initialized.And I have sql database.its name is Cost.I have this code and when I run it gives this error ExecuteNonQuery: Connection property has not been initialized.And I have sql database.its name is Cost.My code is:\[code\] namespace Accountingss{ public partial class WebForm1 : System.Web.UI.Page { public SqlConnection conn; protected void Page_Load(object sender, EventArgs e) { } protected void Connect(string cmdtxt, Hashtable parameters) { conn = new SqlConnection(); string connString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Cost.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"; conn.ConnectionString = connString; SqlCommand cmd = new SqlCommand(); cmd.CommandText = cmdtxt; cmd.Parameters.Clear(); var ieParams = parameters.GetEnumerator(); while (ieParams.MoveNext()) { cmd.Parameters.AddWithValue(ieParams.Key.ToString(), ieParams.Value.ToString()); //cmd.Parameters.Add(new SqlParameter(ieParams.Key.ToString(), ieParams.Value.ToString())); } conn.Open(); cmd.ExecuteNonQuery(); //SqlDataAdapter costdataAdpater = new SqlDataAdapter(); //DataTable costdataTable = new DataTable(); } protected void Button1_Click(object sender, EventArgs e) { string insert = "INSERT INTO Cost (Type, Amount) VALUES (@type, @amount)";// +type.Text + ',' + a.Text + ")"; var addpTA = new Hashtable(); addpTA.Add("@type", txtType.Text); addpTA.Add("@amount", txtAmount.Text); Connect(insert, addpTA); } }}\[/code\]