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int sum = 0;
for (int i = 0; i < this.dataGridView1.Rows.Count; i++)
{
sum += int.Parse(this.dataGridView1.Rows[i].Cells["ColumnName"].Value.ToString());
}
label.Text = sum.ToString();
int sum = 0;
for (int i = 0; i < this.dataGridView1.Rows.Count; i++)
{
sum += int.Parse(this.dataGridView1.Rows[i].Cells["ColumnName"].Value.ToString());
}