cmd.Parameters.AddWithValue("@StudentName", txtName.Text);
cmd.Parameters.AddWithValue("@ContactNo", txtSNo.Text);
cmd.Parameters.AddWithValue("@FathersNo", txtFNo.Text);
cmd.Parameters.AddWithValue("@MothersNo", txtMNo.Text);
cmd.Parameters.AddWithValue("@Email", txtEID.Text);
cmd.ExecuteNonQuery();

var data = new Dictionary<string, TextBox>
     {
        {"@StudentName", txtName},
        {"@ContactNo", txtSNo},
        {"@FathersNo", txtFNo},
        {"@MothersNo", txtMNo},
        {"@Email", txtEID}
     };

     foreach (var kvp in data)
     {
        cmd.Parameters.AddWithValue(kvp.Item1, kvp.Item2);
     }

     cmd.ExecuteNonQuery();