看了半天，我终于知道你是在添加行，并不是绑定——你是试图从数据库中逐行读取数据，然后赋值到Combobox中，对不？请不要这样做！请直接把DataTable作为数据源赋值给GridView！

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void button1_Click(object sender, EventArgs e)

{

DataTable dt = new DataTable();

dt.Columns.Add("Id", typeof(int));

dt.Columns.Add("Name", typeof(string));

dt.Rows.Add(1, "内容1");

dt.Rows.Add(2, "内容2");

DataGridViewComboBoxColumn c = new DataGridViewComboBoxColumn();

c.DataSource = dt;

c.DisplayMember = "Name";

c.ValueMember = "Id";

c.DataPropertyName = "Id";

dataGridView1.Columns.Add(c);

//模拟数据库内容！

DataTable dt2 = new DataTable();

dt2.Columns.Add("Id", typeof(int));

for (int i = 1; i < 11; i++)

{

dt2.Rows.Add(i % 2 == 0 ? 1 : 2);

}

dataGridView1.DataSource = dt2;

}

}