Give me any one idea.
private void btnDelete_Click(object sender, EventArgs e)
int IdColumn = 0; // enter the correct value for Id Column or the column which you are using it for deleting..
foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
int id = Convert.ToInt32(row.Cells[IdColumn].Value);
// write your sql command to delete this id
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