Must declare scalar variable in login form

Question

I am getting error "Must declare scalar variable  @uname and @pw". I have tried many methods but its not working. please guide me to find the issue in my belo code.

 

private void button1_Click(object sender, EventArgs e)
{
OleDbConnection con = new OleDbConnection(@"Provider=SQLOLEDB;Data Source=DESKTOP\SQLEXPRESS;User ID=sa; Password = pwd; Initial Catalog=database; Integrated secutity=SSPI");
con.Open();
OleDbCommand cmd = new OleDbCommand("select Username,password from login where Username=@uname and password=@pw", con);
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
cmd.Parameters.Clear();
//cmd.Parameters.AddWithValue("@uname", textBox1.Text);
//cmd.Parameters.AddWithValue("@pw", textBox1.Text);
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count > 0)
{
MessageBox.Show("success");
}
else
{
MessageBox.Show("incorrect");
}
con.Close();}