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我使用Visual Studio 2008創建Windows應用程序。我想以斷開的方式創建登錄表單。我面臨的一個問題是,當我試圖檢查DataTable是否被填充時,它表明它始終被填充。c中斷開連接體系結構的登錄表單#
的登錄按鈕代碼:
try
{
//getting connectionString
mcc = new myConnectionClass();
conString = mcc.MyConnection;
//opening connection con
con = new SqlConnection(conString);
string queryString = "select * from LOGIN_TABLE where LOGIN_ID = @LOGIN_ID and LOGIN_PASSWORD = @LOGIN_PASSWORD";
//dataset ds , SqlDataAdapter sda
ds = new DataSet();
sda = new SqlDataAdapter();
//sqlcommand
cmd = new SqlCommand(queryString, con);
cmd.Parameters.Add(new SqlParameter("LOGIN_ID", txtLogin.Text));
cmd.Parameters.Add(new SqlParameter("LOGIN_PASSWORD", txtPass.Text));
sda.SelectCommand = cmd;
sda.Fill(ds, "LOGIN_TABLE");
//datatable dt
dt = ds.Tables["LOGIN_TABLE"];
//checking is datatable is empty
if (dt != null)
{
MessageBox.Show("Login Successed");
}
else
{
MessageBox.Show("Login Failed");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
ds.Clear();
dt.Clear();
}
嘿感謝它正在 – 2012-03-10 17:44:33
u能告訴我,如果東西除了可以做,以提高該代碼 – 2012-03-10 17:45:26
使用在你的SqlConnection,以確保正確的關閉,該資源 – Steve 2012-03-10 17:48:12