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private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("abc");
this.dataGridView1.DataSource = dt;
}
private void button1_Click(object sender, EventArgs e)
{
DataTable dt = this.dataGridView1.DataSource as DataTable;
DataRow row = dt.NewRow();
row[0] = "aaa";
dt.Rows.Add(row);
}