Question

I am trying to insert from code behind on an asp.net form,

I have two tables:
Table Trainings
training_id
training_Date
.
.

Table personTraining
id
training_id
name,
dept

Am I doing something wrong?

I need to insert the values from the form , plus, select the values from a lookup table , where the training id is equal to dropdown selected value .

private void InsertInfo()
    {

        SqlConnection conn = new SqlConnection(GetConnectionString());
        string sql = "INSERT INTO personTraining (name,training_id,training,trainingDate.trainingHour,trainingSession)  VALUES (@Val1,SELECT (training_id,training,trainingDate.trainingHour,trainingSession FROM tbl_training WHERE training_id = dpDate.selectedValue))";
        try
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            cmd.Parameters.AddWithValue("@Val1", txtName.Text);
//will add rest of form fields

            cmd.CommandType = CommandType.Text;
            cmd.ExecuteNonQuery();
        }

Answer 1

You would need to use something like

INSERT INTO personTraining
            (name,
             training_id,
             training,
             trainingDate.trainingHour,
             trainingSession)
SELECT @Val1,
       training_id,
       training,
       trainingDate.trainingHour,
       trainingSession
FROM   tbl_training
WHERE  training_id = dpDate.selectedValue  

You can’t have a hybrid VALUES clause/SELECT statement like that.