how to retrive data from the database based on a value of the cell of the datagridview

Question

我有一个datagridview，它显示客户详细信息列表，例如客户ID，姓名等。当我单击特定客户行然后单击按钮时，我希望该客户的客户ID存储在字符串中，然后将使用MySQL命令来检索客户的菜单选项。例如，从菜单中选择*，其中customerid =（从datagridview获得的字符串）

Answer 1

Try this

private void button1_Click(object sender, EventArgs e)
{
    if (dataGridView1.SelectedCells.Count > 0)
    {
        int selectedrowindex = dataGridView1.SelectedCells[0].RowIndex;
        DataGridViewRow selectedRow = datagridview1.Rows[selectedrowindex];  
        string CustumerID = Convert.ToString(selectedRow.Cells["column name"].Value);           
    }
}

or this

private void button1_Click(object sender, EventArgs e)
{
    int SelectedRowndex = dataGridView1.CurrentCell.RowIndex;
    string CustumerID= dataGridView1.Rows[SelectedRowndex].Cells["column name"].Value.ToString();
}