Error - Adding rows programmatically to a datagridview.

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C#3.5

Hi.

Im reading a list of learners from an sql database through 3-tier architecture.

I need to add each learner individually with reference number (learnerID) to a datagridview. If there's more learners, then it should just add to current list.

I retrieve all learners from the businessLayer and place it in a List. Then i convert the List to an array.

this.dgvLearners.DataSource = Blayer.GetLearners((int)learnerIDgo); 
    //get first learner
foreach (int id in learnerIDS)//reading from array of Lists
{
    learnerIDgo = id;
    this.dgvLearners.Rows.Add(Blayer.GetLearners((int)learnerIDgo));
    //get and add all the additional learners
}

Error - Doesn't allow me to add rows programmatically to a datagridview.