We Keep Coding

update bit datatype value in database

try
{
UserMaster ObjUserMst = new UserMaster();
ObjUserMst.GetData("UPDATE MemberDetails SET Active = 0 WHERE Member_No = '" + txtmemberno.Text + "'");
MessageBox.Show("Installment Close Successfully.", "Close Installment", MessageBoxButtons.OK, MessageBoxIcon.Information);
btndebit.Visible = true;
btndebit.Visible = false;
}
catch (Exception ex)
{
XtraMessageBox.Show(ex.Message.ToString(), "btncloseinstallment_Click", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
its get data code
public DataTable GetData(string Query)
{
string cn = GlobalClass.ConnectionStringGet();
Con = new SqlConnection(cn);
cmd = new SqlCommand();
cmd.Connection = Con;
if (cmd.Connection.State == ConnectionState.Closed)
{
cmd.Connection.Open();
}
SqlTransaction ObjTrans = cmd.Connection.BeginTransaction();
cmd.Transaction = ObjTrans;
cmd.CommandType = CommandType.Text;
cmd.CommandText = Query;
cmd.CommandTimeout = 500;
SqlDataReader dreader = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(dreader);
Con.Close();
Con.Dispose();
return dt;
}
i have winforms.
i have memberdetails Table - in this Active Field & its datatype is BIT. its
default value is 1. but i need to update it to 0.
1 = ture
0 = false
when i tried above code Active Field data didnt update
but i got message "Installment Close Successfully."
http://i.stack.imgur.com/mkuhW.png
http://i.stack.imgur.com/ToXFV.png
I upload my images on above link
help me guys.. sorry if i didnt explain very well bcz i m new here

ok i got it.
string constring = GlobalClass.ConnectionStringGet();
string sqlUpdate = "UPDATE MemberDetails SET Active = '0' WHERE Member_No = '" + txtmemberno.Text + "'";
SqlConnection conDatabase = new SqlConnection(constring);
SqlCommand cmdd = new SqlCommand(sqlUpdate, conDatabase);
conDatabase.Open();
cmdd.ExecuteNonQuery();
conDatabase.Close();
MessageBox.Show("Installment Close Successfully.");
its update Active Field 1 to 0 successfully.

C# MySqlConnector next query in the same connection

I have the following code:
string myConnection = "server=localhost;database=test;uid=test;password=test";
string query = "SELECT label_type, label, quantity FROM system_printserver WHERE print=0";
try
{
MySqlConnection myConn = new MySqlConnection(myConnection);
myConn.Open();
MySqlCommand command = new MySqlCommand(query, myConn);
MySqlDataAdapter adapter = new MySqlDataAdapter(command);
DataTable data = new DataTable();
adapter.Fill(data);
dataGridView1.DataSource = data;
printDocument1.PrintPage += new PrintPageEventHandler(printDocument1_PrintPage);
MySqlDataReader myReader;
myReader = command.ExecuteReader();
while (myReader.Read()) {
orderNumber = myReader.GetString(1);
myReader.Close();
string queryOrder = "SELECT id_order, id_carrier FROM ps_orders WHERE id_order=28329";
MySqlCommand commandOrder = new MySqlCommand(queryOrder, myConn);
MySqlDataReader myReaderOrder;
myReaderOrder = commandOrder.ExecuteReader();
idCarrier = myReaderOrder.GetString(1);
printDocument1.Print();
}
I have a problem because the second query string queryOrder doesn't work. The query is Ok but variable "idCarrier" doesn't accept any value.

I don't believe you can attach another reader to a connection, when one is already open and processing records. You must retrieve all your records first, i.e. ToList() or Dataset, or use a secondary connection for the second reader.
To make your life easier, consider using Dapper or Linq2Db, two awesome micro-ORMs.

Try it like this:
using(var connection = new MySqlConnection("server=localhost;database=test;uid=test;password=test") {
connection.Open();
int orderNumber = 0;
using (var command = connection.CreateCommand()) {
command.CommandText = #"SELECT label_type, label, quantity FROM system_printserver WHERE print=0";
DataTable data = new DataTable();
adapter.Fill(data);
dataGridView1.DataSource = data;
var reader = command.ExecuteReader();
printDocument1.PrintPage += new PrintPageEventHandler(printDocument1_PrintPage);
if(reader.Read()) {
orderNumber = Convert.ToInt32(reader.GetString(1));
}
}
using(var command = connection.CreateCommand()) {
command.CommandText = string.format(#"SELECT id_order, id_carrier FROM ps_orders WHERE id_order={0}",orderNumber);
var reader = command.ExecuteReader();
if(reader.Read()){
printDocument1.Print();
return reader.GetString(1);
}
}
}

Combobox Showing Old Database Values

I retrived values by the use of SqlCommand and SqlReader from column and stored in List<String> and the added to ComboBox(Type:DropDownList) but Eventhough i have deleted Some of this values from database Combobox is still showing it.
I am clearing items befor allocating by
mycombobox.Items.Clear();
It looks as it is not affected by values I retrive every time when the Form gets Loaded.
SqlDataReader rdr1 = null;
SqlConnection con1 = null;
SqlCommand cmd1 = null;
try
{
List<string> namesCollection=new List<string>();
// Open connection to the database
string ConnectionString = #"Data Source=MyPC-PC\SQLEXPRESS;Initial Catalog=DryDB;Integrated Security=True";
con1 = new SqlConnection(ConnectionString);
con1.Open();
cmd1 = new SqlCommand();
cmd1.CommandType = CommandType.Text;
cmd1.CommandText = "SELECT PName from MASTER order by PName";
cmd1.Connection = con1;
rdr1 = cmd1.ExecuteReader();
namesCollection.Add("Select");
if (rdr1.Read()==true)
{
do
{
namesCollection.Add("" + rdr1[0].ToString());
} while (rdr1.Read()) ;
}
else
{
}
foreach(string pname in namesCollection)
cb.Items.Add(pname);
namesCollection.Clear();
cb.SelectedIndex =0;
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
if (rdr1 != null)
rdr1.Close();
if (con1.State == ConnectionState.Open)
con1.Close();
}
Thanks in advance.

Use the DataSource property of the Combobox instead of the adding the items one by one. So your code will be something like the following:
SqlDataReader rdr1 = null;
SqlConnection con1 = null;
SqlCommand cmd1 = null;
try
{
List<string> namesCollection = new List<string>();
// Open connection to the database
string ConnectionString = #"Data Source=MyPC-PC\SQLEXPRESS;Initial Catalog=DryDB;Integrated Security=True";
con1 = new SqlConnection(ConnectionString);
con1.Open();
cmd1 = new SqlCommand();
cmd1.CommandType = CommandType.Text;
cmd1.CommandText = "SELECT PName from MASTER order by PName";
cmd1.Connection = con1;
rdr1 = cmd1.ExecuteReader();
namesCollection.Add("Select");
if (rdr1.Read()==true)
{
do
{
namesCollection.Add("" + rdr1[0].ToString());
} while (rdr1.Read()) ;
}
else
{
}
//Replace this part...
//foreach(string pname in namesCollection)
//cb.Items.Add(pname);
//With this...
cb.DataSource = namesCollection;
cb.SelectedIndex =0;
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
if (rdr1 != null)
rdr1.Close();
if (con1.State == ConnectionState.Open)
con1.Close();
}
There is a similar question here
Hope this helps

Let's say the code to populate the ComboBox is placed in the populate_cb() method
private void populate_cb(){
cb.Items.Clear();
SqlDataReader rdr1 = null;
SqlConnection con1 = null;
SqlCommand cmd1 = null;
try
{
// Open connection to the database
string ConnectionString = #"Data Source=MyPC-PC\SQLEXPRESS;Initial Catalog=DryDB;Integrated Security=True";
con1 = new SqlConnection(ConnectionString);
con1.Open();
cmd1 = new SqlCommand();
cmd1.CommandType = CommandType.Text;
cmd1.CommandText = "SELECT PName from MASTER order by PName";
cmd1.Connection = con1;
rdr1 = cmd1.ExecuteReader();
cb.Items.Add("Select");
while(rdr1.Read())
{
cb.Items.Add(rdr1[0].ToString());
}
cb.SelectedIndex =0;
con1.Close();
}
catch(Exception ex){
// handle exception
}
}//end of populate_cb()
Call populate_cb() method form form_load() and
Call from the place after the deletion process
You need to make sure your deletion process really deletes the records from database!

How to get list of all database from sql server in a combobox using c#.net

I am entering the source name userid and password through the textbox and want the database list should be listed on the combo box so that all the four options sourcename, userid, password and databasename can be selected by the user to perform the connectivity
The databases are to be retrieve from other system as per the user. User will enter the IP, userid and password and they should get the database list in the combo box so that they can select the required database and perform the connectivity
private void frmConfig_Load(object sender, EventArgs e)
{
try
{
string Conn = "server=servername;User Id=userid;" + "pwd=******;";
con = new SqlConnection(Conn);
con.Open();
da = new SqlDataAdapter("SELECT * FROM sys.database", con);
cbSrc.Items.Add(da);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
I am trying to do this but it is not generating any data

sys.databases
SELECT name
FROM sys.databases;
Edit:
I recommend using IDataReader, returning a List and caching the results. You can simply bind your drop down to the results and retrieve the same list from cache when needed.
public List<string> GetDatabaseList()
{
List<string> list = new List<string>();
// Open connection to the database
string conString = "server=xeon;uid=sa;pwd=manager; database=northwind";
using (SqlConnection con = new SqlConnection(conString))
{
con.Open();
// Set up a command with the given query and associate
// this with the current connection.
using (SqlCommand cmd = new SqlCommand("SELECT name from sys.databases", con))
{
using (IDataReader dr = cmd.ExecuteReader())
{
while (dr.Read())
{
list.Add(dr[0].ToString());
}
}
}
}
return list;
}

First add following assemblies:
Microsoft.SqlServer.ConnectionInfo.dll
Microsoft.SqlServer.Management.Sdk.Sfc.dll
Microsoft.SqlServer.Smo.dll
from
C:\Program Files\Microsoft SQL Server\100\SDK\Assemblies\
and then use below code:
var server = new Microsoft.SqlServer.Management.Smo.Server("Server name");
foreach (Database db in server.Databases) {
cboDBs.Items.Add(db.Name);
}

you can use on of the following queries:
EXEC sp_databases
SELECT * FROM sys.databases
Serge

Simply using GetSchema method:
using (SqlConnection connection = GetConnection())
{
connection.Open();
DataTable dtDatabases = connection.GetSchema("databases");
//Get database name using dtDatabases["database_name"]
}

using (var connection = new System.Data.SqlClient.SqlConnection("ConnectionString"))
{
connection.Open();
var command = new System.Data.SqlClient.SqlCommand();
command.Connection = connection;
command.CommandType = CommandType.Text;
command.CommandText = "SELECT name FROM master.sys.databases";
var adapter = new System.Data.SqlClient.SqlDataAdapter(command);
var dataset = new DataSet();
adapter.Fill(dataset);
DataTable dtDatabases = dataset.Tables[0];
}

How to get list of all database from sql server in a combobox using c# asp.net windows application
try
{
string Conn = "server=.;User Id=sa;" + "pwd=passs;";
SqlConnection con = new SqlConnection(Conn);
con.Open();
SqlCommand cmd = new SqlCommand();
// da = new SqlDataAdapter("SELECT * FROM sys.database", con);
cmd = new SqlCommand("SELECT name FROM sys.databases", con);
// comboBox1.Items.Add(cmd);
SqlDataReader dr;
dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())
{
//comboBox2.Items.Add(dr[0]);
comboBox1.Items.Add(dr[0]);
}
}
// .Items.Add(da);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

Try this:
SqlConnection con = new SqlConnection(YourConnectionString);
SqlCommand cmd = new SqlCommand("SELECT name from sys.databases", con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
cbSrc.Items.Add(dr[0].ToString());
}
con.Close();
or this:
DataSet ds = new DataSet();
SqlDataAdapter sqlda = new SqlDataAdapter("SELECT name from sys.databases", YourConnectionString);
sqlda.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
cbSrc.Items.Add(ds.Tables[0].Rows[i][0].ToString());
}

public static List<string> GetAllDatabaseNamesByServerName(string ServerName, [Optional] string UserID, [Optional] string Password)
{
List<string> lstDatabaseNames = null;
try
{
lstDatabaseNames = new List<string>();
//string servername = System.Environment.MachineName;
string newConnString = string.Format("Data Source={0};", ServerName);
if (UserID == null)
{
newConnString += "Integrated Security = True;";
}
else
{
newConnString += string.Format("User Id ={0}; Password={1};", UserID, Password);
}
SqlConnection con = new SqlConnection(newConnString);
con.Open();
SqlCommand cmd = new SqlCommand("SELECT name FROM master.sys.databases", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
foreach (DataRow row in dt.Rows)
{
lstDatabaseNames.Add(row[0].ToString());
}
con.Close();
return lstDatabaseNames;
}
finally
{
}
}

Problem with usage of multiple DataReaders in ASP.NET(C#)

SqlConnection conn1 = new SqlConnection("Server=ILLUMINATI;" + "Database=DB;Integrated Security= true");
SqlCommand COMM = new SqlCommand("select Role from Login where User_Name='admin'", conn1);
conn1.Open();
SqlDataReader reader = COMM.ExecuteReader();
while (reader.Read())
{
string s = reader["Role"].ToString();
}
reader.Close();
conn1.Close();
SqlConnection conn = new SqlConnection("Server=ILLUMINATI;" + "Database=DB;Integrated Security= true");
SqlCommand comm = new SqlCommand("Select * from FileUpload where UploadedBy='"+NAME+"'",conn);
try
{
conn.Open();
SqlDataReader rdr = comm.ExecuteReader();
if (s.Equals("admin"))
{
GridView1.DataSource = rdr;
GridView1.DataBind();
}
if(s.Equals("teacher"))
{
GridView2.DataSource = rdr;
GridView2.DataBind();
}
rdr.Close();
//reader.Close();
}
catch
{
conn.Close();
}
I'm getting error in the below connection saying s does not exist in the current context. How to use the multiple datareaders please help me.

Declare string s out of hte loop
string s;
while (reader.Read())
{
s = reader["Role"].ToString();
}

SqlConnection conn1 = new SqlConnection("Server=ILLUMINATI;" + "Database=DB;Integrated Security= true");
SqlCommand COMM = new SqlCommand("select Role from Login where User_Name='admin'", conn1);
conn1.Open();
SqlDataReader reader = COMM.ExecuteReader();
string s = String.Empty;
while (reader.Read())
s = reader["Role"].ToString();