Llenar un ComboBox en Windows forms

[Peterpay]

Con un DataTable

public partial class Form1 : Form
{
SqlConnection con = new SqlConnection("data source=.;initial catalog=deepra;uid=sa;pwd=;");
SqlDataAdapter ad;
SqlCommandBuilder cbuilder;
DataTable dt = new DataTable();

public Form1()
{
InitializeComponent();
}

private void BtnLoad_Click(object sender, EventArgs e)
{
ad = new SqlDataAdapter("select * from student", con);
cbuilder = new SqlCommandBuilder(ad);
ad.InsertCommand = cbuilder.GetInsertCommand();
ad.UpdateCommand = cbuilder.GetUpdateCommand();
ad.DeleteCommand = cbuilder.GetDeleteCommand();

dt.Clear();
ad.Fill(dt);
dataGridView1.DataSource = dt;
}

private void BtnUpdate_Click(object sender, EventArgs e)
{

DataTable changetData= dt.GetChanges();
if(changetData!=null)
{
ad.Update(dt);
MessageBox.Show("Updated");
}
}

private void BtnCancel_Click(object sender, EventArgs e)
{
DataTable changetData = dt.GetChanges();
if (changetData != null)
{
dt.RejectChanges();
MessageBox.Show("RollBacked");
}
}
}


Saludos
peter