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private void textBox9_TextChanged(object sender, EventArgs e)
{
int i;
for (i = 0; i < dataGridView1.RowCount; i++)
{
if (dataGridView1.Rows[i].Cells[4].Value.ToString().Trim() == textBox9.Text.ToString().Trim())
{
dataGridView1.Rows[i].Selected = true;
}
else
{
dataGridView1.Rows[i].Selected = false;
}
}
}