-1
我有一个错误,显示连接未关闭。
我甚至通过把一个最后但还没试过它不工作。数据库值在文本框中,如果选择Combobox
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "SELECT * FROM Dataaa WHERE FirstName='" + comboBox1.Text + "'";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
txt_EID.Text = reader["EID"].ToString();
textBox1.Text = reader["Firstname"].ToString();
textBox2.Text = reader["LastName"].ToString();
textBox3.Text = reader["ICNO"].ToString();
textBox4.Text = reader["Address"].ToString();
textBox5.Text = reader["Loan"].ToString();
textBox6.Text = reader["Percent"].ToString();
textBox7.Text = reader["Payback"].ToString();
textBox8.Text = reader["StartDate"].ToString();
textBox9.Text = reader["EndDate"].ToString();
textBox10.Text = reader["Monthly"].ToString();
textBox11.Text = reader["PaymentType"].ToString();
textBox12.Text = reader["Remark"].ToString();
}
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("error " + ex);
}
请将您的问题中的代码发布为TEXT。图像难以阅读,也无法创建代码来测试您的问题 – Steve
如果您在OleDbConnection类型的全局变量上发生连接打开错误,则需要检查代码中忘记关闭该连接的每个部分(例如如果你输入一个catch块并忘记关闭连接) – Steve
对于初学者,你应该总是关闭你的连接在finally块中。 –