I was trying to display a table that is being saved in my sql server and I wanted it to be displayed in my panal but it kept showing this error saying 'panel' doesnot contain a definition for 'Datasource' and no extension method 'datasource' accepting a first argument of type 'panel' could be found (are you missing a using directive or an assembly reference?) please help..
public partial class Form17 : Form
{
public Form17()
{
InitializeComponent();
ShowTGBtbl();
}
private void button5_Click(object sender, EventArgs e)
{
}
private void Form17_Load(object sender, EventArgs e)
{
int w = Screen.PrimaryScreen.Bounds.Width;
int h = Screen.PrimaryScreen.Bounds.Height;
this.Location = new Point(0, 0);
this.Size = new Size(w, h);
}
SqlConnection Con = new SqlConnection(#"Data Source=LAPTOP-9514GUKU\SQLEXPRESS;Initial Catalog=Mydatabase.com;Integrated Security=True");
private void ShowTGBtbl()
{
Con.Open();
string Query = "select * from TGBtbl";
SqlDataAdapter sda = new SqlDataAdapter(Query, Con);
SqlCommandBuilder Builder = new SqlCommandBuilder(sda);
var ds = new DataSet();
sda.Fill(ds);
TGBoverall.Datasource = ds.Tables[0];
Con.Close();
}
Related
I have the following function:
Public Function OleDBCSVToDataTable(directory As String, tableName As String, fileName As String, Optional start As Long = 0) As DataTable
Dim CnStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & directory & ";Extended Properties='Excel 8.0;HDR=YES'"
Dim dt As DataTable = GetTableSchema(tableName)
Using Adp As New OleDbDataAdapter("select * from [" & fileName & "]", CnStr)
Adp.Fill(start, 1000, dt)
End Using
Return dt
End Function
The function is designed to read a CSV into a data table using OLEDB for import into SQL, however I am receiving this error:
"The Microsoft Access database engine cannot open or write to the file
'C:\TEST'. It is already opened exclusively by another user, or you
need permission to view and write its data."
I have attempted this solution. All permissions have been granted (permissions are Full Control across users):
I have seen this solution as well, however, the proposed options other than OLEDB are solutions that don't seem to work with CSV. Besides, I imagine there are native libraries.
I am open to suggestions for better ways to accomplish this, however, based on requirements - large CSVs, data validation - this appears to be the best, assuming I am able to get it working.
How about importing the CSV file into a DataGridView, and then exporting from that object into MS Access?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Globalization;
using System.Configuration;
using System.Data.OleDb;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void button1_Click(object sender, EventArgs e)
{
string delimiter = ",";
string tablename = "medTable";
DataSet dataset = new DataSet();
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "CSV Files (*.csv)|*.csv|All Files (*.*)|*.*";
openFileDialog1.FilterIndex = 1;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
if (MessageBox.Show("Are you sure you want to import the data from \n " + openFileDialog1.FileName + "?", "Are you sure?", MessageBoxButtons.YesNo) == DialogResult.Yes)
{
filename = openFileDialog1.FileName;
StreamReader sr = new StreamReader(filename);
string csv = File.ReadAllText(openFileDialog1.FileName);
dataset.Tables.Add(tablename);
dataset.Tables[tablename].Columns.Add("Order ID");
dataset.Tables[tablename].Columns.Add("Product");
dataset.Tables[tablename].Columns.Add("Unit Price");
dataset.Tables[tablename].Columns.Add("Quantity");
dataset.Tables[tablename].Columns.Add("Discount");
string allData = sr.ReadToEnd();
string[] rows = allData.Split("\r".ToCharArray());
foreach (string r in rows)
{
string[] items = r.Split(delimiter.ToCharArray());
dataset.Tables[tablename].Rows.Add(items);
}
this.dataGridView1.DataSource = dataset.Tables[0].DefaultView;
MessageBox.Show(filename + " was successfully imported. \n Please review all data before sending it to the database.", "Success!", MessageBoxButtons.OK);
}
else
{
this.Close();
}
}
}
public string filename { get; set; }
private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
{
}
private void Import_Load(object sender, EventArgs e)
{
}
private void button4_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();
}
private void button3_Click(object sender, EventArgs e)
//remove the semicolon, and add brackets below after line
{
//create the connection string
string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\Ryan\\Desktop\\Coding\\Microsoft Access\\Northwind_2012.mdb";
//create the database query
string query = "SELECT * FROM [OrderDetailsTest]";
//create an OleDbDataAdapter to execute the query
OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
//create a command builder
OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(dAdapter);
//create a DataTable to hold the query results
DataTable dTable = new DataTable();
//fill the DataTable
dAdapter.Fill(dTable);
//the DataGridView
DataGridView dataGridView1 = new DataGridView();
//BindingSource to sync DataTable and DataGridView
BindingSource bSource = new BindingSource();
//set the BindingSource DataSource
bSource.DataSource = dTable;
//set the DataGridView DataSource
dataGridView1.DataSource = bSource;
// An update function to get the changes back into the database.
dAdapter.Update(dTable);
}
}
}
I am stuck with this problem since yesterday. I have created a button, which when clicked display the results from a SQL Server table. I thought of using MessageBox to print these results or if there is any other way to print results?
private void button1_Click(object sender, EventArgs e)
{
try
{
SqlConnection con = new SqlConnection("Data Source=FAREEDH;Initial Catalog=DeakinsTrade;Integrated Security=True");
SqlCommand command = new SqlCommand("SELECT * FROM Products", con);
con.Open();
SqlDataReader reader = command.ExecuteReader();
command.ExecuteNonQuery();
con.Close();
}
catch (Exception es)
{
MessageBox.Show(es.Message);
}
}
I have tried different methods but it never worked.. I am really stuck. If you want more details, let me know. Thanks for the help in advance
Add a datagridview control to show multiple rows and try this code and rename it what you want and replace this YourDataGridVeiwName from the name you set for datagridview control and try below code
private void button1_Click(object sender, EventArgs e)
{
try
{
string connectionString = "Data Source=FAREEDH;Initial Catalog=DeakinsTrade;Integrated Security=True";
string query = "SELECT ProductName FROM Products;";
using (SqlConnection con = new SqlConnection(connectionString))
using (SqlCommand command = new SqlCommand(query, con))
{
con.Open();
using (SqlDataAdapter sda = new SqlDataAdapter(command))
{
DataTable dt = new DataTable();
sda.Fill(dt);
YourDataGridVeiwName.DataSource= dt;
}
con.Close();
}
}
catch (Exception es)
{
MessageBox.Show(es.Message);
}
}
You need to use the SqlDataReader and iterate over the rows returned, extract what you need from each row, and then display that to the enduser.
I modified your code a bit, to make it safer (using blocks!), and I modified the query to return only the product name (assuming you have that) since you cannot really display a whole row in a message box....
private void button1_Click(object sender, EventArgs e)
{
try
{
string connectionString = "Data Source=FAREEDH;Initial Catalog=DeakinsTrade;Integrated Security=True";
string query = "SELECT ProductName FROM Products;";
using (SqlConnection con = new SqlConnection(connectionString))
using (SqlCommand command = new SqlCommand(query, con))
{
con.Open();
using (SqlDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
string productName = reader.GetFieldValue<string>(0);
MessageBox("Product is: " + productName);
}
reader.Close();
}
con.Close();
}
}
catch (Exception es)
{
MessageBox.Show(es.Message);
}
}
I think this is one of those times where I'm looking at the code and it all seems fine because my eye's think it will be. I need a fresh set of eyes to look at this code and tell me way it's not loading into the first datagrid view. Thank you for any help your able to provide.
private DataSet DataSetRentals { get; set; }
public DataRelationForm()
{
InitializeComponent();
}
private void DataRelationForm_Load(object sender, EventArgs e)
{
DataSet relationship = new DataSet("relationship");
/////
SqlConnection conn = Database.GetConnection();
SqlDataAdapter adapter = new SqlDataAdapter("Select * From Car", conn);
DataSet DataSetRentals = new DataSet("Relationship");
adapter.FillSchema(DataSetRentals, SchemaType.Source, "Car");
adapter.Fill(DataSetRentals, "Car");
adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
adapter.Fill(DataSetRentals, "Car");
DataTable Car;
Car = DataSetRentals.Tables["Car"];
foreach (DataRow drCurrent in Car.Rows)
{
Console.WriteLine("{0} {1}",
drCurrent["au_fname"].ToString(),
drCurrent["au_lname"].ToString());
}
////////////////////////////////////
SqlDataAdapter adapter2 = new SqlDataAdapter("Select * From CarRental", conn);
adapter.FillSchema(DataSetRentals, SchemaType.Source, "Rentals");
adapter.Fill(DataSetRentals, "Rentals");
adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
adapter.Fill(DataSetRentals, "Rentals");
DataTable CarRental;
CarRental = DataSetRentals.Tables["Rentals"];
foreach (DataRow drCurrent in CarRental.Rows)
{
Console.WriteLine("{0} {1}",
drCurrent["au_fname"].ToString(),
drCurrent["au_lname"].ToString());
}
/////
SqlDataAdapter adapter3 = new SqlDataAdapter("Select * From Customer", conn);
adapter.FillSchema(DataSetRentals, SchemaType.Source, "Customer");
adapter.Fill(DataSetRentals, "Customer");
adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
adapter.Fill(DataSetRentals, "Customer");
DataTable Customer;
Customer = DataSetRentals.Tables["Customer"];
foreach (DataRow drCurrent in Customer.Rows)
{
Console.WriteLine("{0} {1}",
drCurrent["au_fname"].ToString(),
drCurrent["au_lname"].ToString());
}
////////////////////////
DataSetRentals.Tables.Add(Customer);
DataSetRentals.Tables.Add(CarRental);
DataSetRentals.Tables.Add(Car);
DataRelation Step1 = new DataRelation("Customer2CarR",
Customer.Columns["CustomerNo"], CarRental.Columns["CustomerNo"]);
DataSetRentals.Relations.Add(Step1);
DataRelation Step2 = new DataRelation("CarR2Car",
Car.Columns["CarID"], CarRental.Columns["CarID"]);
DataSetRentals.Relations.Add(Step2);
////////////////////////
CustomerGrid.DataSource= DataSetRentals.Tables["Customer"];
CarRGrid.DataSource = DataSetRentals.Tables["CarRental"];
CarGrid.DataSource = DataSetRentals.Tables["Car"];
CustomerGrid.SelectionChanged += new EventHandler(Customer_SelectionChanged);
CarRGrid.SelectionChanged += new EventHandler(CarR_SelectionChanged);
}
private void Customer_SelectionChanged(Object sender, EventArgs e)
{
if (CustomerGrid.SelectedRows.Count > 0)
{
DataRowView selectedRow =
(DataRowView)CustomerGrid.SelectedRows[0].DataBoundItem;
DataSetRentals.Tables["CarRental"].DefaultView.RowFilter =
"CustomerNo = " + selectedRow.Row["CustomerNo"].ToString();
}
else
{
}
}
private void CarR_SelectionChanged(Object sender, EventArgs e)
{
if (CarRGrid.SelectedRows.Count > 0)
{
DataRowView selectedRow =
(DataRowView)CarRGrid.SelectedRows[0].DataBoundItem;
DataSetRentals.Tables["Car"].DefaultView.RowFilter =
"CarID = " + selectedRow.Row["CarID"].ToString();
}
}
And this is the code for the Database.GetConnection() method:
SqlConnectionStringBuilder stringBuilder = new SqlConnectionStringBuilder();
bool OnUni;
OnUni = (System.Environment.UserDomainName == "SOAC") ? true : false;
stringBuilder.DataSource = (OnUni) ? #"SOACSQLSERVER\SHOLESQLBSC" : "(local)";
stringBuilder.InitialCatalog = "CarRental_P117365";
stringBuilder.IntegratedSecurity = true;
return new SqlConnection(stringBuilder.ConnectionString);
It looks like you may have forgotten to call SqlConnection.Open() to actually open the connection. I would also recommend wrapping your connection in a using and explicitly calling SqlConnection.Close() at the end of it, so you don't accidentally leave it open:
using(SqlConnection conn = Database.GetConnection())
{
conn.Open();
/*
rest of code here
*/
conn.Close();
}
For some other good information/examples of properly opening/disposing of SqlConnections, you can also take a look at these SO questions:
Close and Dispose - which to call?
Do I have to Close() a SQLConnection before it gets disposed?
in a "using" block is a SqlConnection closed on return or exception?
youre not binding your data to any datasoruce.
try something like this
using(SqlConnection conn = Database.GetConnection())
try
{
{
------your code here up to DataTable Car-----
DataTable Car;
Car = DataSetRentals.Tables["Car"];
gridview.Datasource = Car;
}
}
catch (SqlException sqlex )
{
string msg = "Fetch Error:";
msg += sqlex.Message;
throw new Exception(msg);
}
Theres no need to open or close the SQL connection as this is done using the using statement at the top where it opens, and when its finishes closes \ disposes of the connection
suppose i have max(pid)=1001 if i want to display values of 1002 which is through +1 into max value so how can i do
This is my entire code i want to select max(pid) and want to display that into textbox
public PatientRegistration()
{
InitializeComponent();
string connectionstring = "DATABASE=hmanagmentsystem;UID=root;PASSWORD=;SERVER=localhost";
con = new MySqlConnection(connectionstring);
con.Open();
}
private void PatientRegistration_Load(object sender, EventArgs e)
{
MySqlCommand command = new MySqlCommand("select max(pid) from patientreg",con);
int cmd=Int32.Parse(command.ExecuteScalar().ToString());
con.Close();
}
How about:
MySqlCommand command = new MySqlCommand("select max(pid) + 1 from patientreg",
con);
More fully:
string connectionString;
public PatientRegistration()
{
InitializeComponent();
connectionString = "DATABASE=hmanagmentsystem;UID=root;PASSWORD=;SERVER=localhost";
}
private void PatientRegistration_Load(object sender, EventArgs e)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open;
using (SqlCommand = new SqlCommand("select max(pid) + 1 from patientreg",conn))
{
// this assumes an asp:TextBox called IDTextBox
IDTextBox.Text = command.ExecuteScalar().ToString();
}
}
}
This is a continution of my previous question: Could not find an implementation of the query pattern
Now I managed to query my database I can't seem to get the content on my webpage.
I try to return the code using the following code:
private void button1_Click(object sender, RoutedEventArgs e)
{
Service1Client client = new Service1Client();
client.GetPersoonByIDCompleted += new EventHandler<GetPersoonByIDCompletedEventArgs>(client_GetPersoonByIDCompleted);
client.GetPersoonByIDAsync("1");
}
void client_GetPersoonByIDCompleted(object sender, GetPersoonByIDCompletedEventArgs e)
{
if (e.Error != null)
textBox1.Text = e.Error.ToString();
else
label1.Content = e.Result.Voornaam.ToString();
}
However when I press the button I get the following errors:
Object reference not set to an instance of an object.
at
SilverlightApplication1.MainPage.client_GetPersoonByIDCompleted(Object
sender, GetPersoonByIDCompletedEventArgs e) at
SilverlightApplication1.ServiceReference1.Service1Client.OnGetPersoonByIDCompleted(Object
state)
The weird thing is it works when I do not use LINQ, but normal SQL.
string sql = "SELECT ID, naam, voornaam, leeftijd FROM tblPersoon WHERE id=#pmID";
Persoon pers = null;
string connstr = ConfigurationManager.ConnectionStrings["connDB"].ConnectionString;
using (SqlConnection cn = new SqlConnection(connstr))
{
SqlCommand com = new SqlCommand(sql, cn);
com.Parameters.AddWithValue("pmID", id);
cn.Open();
SqlDataReader reader = com.ExecuteReader();
if (reader.Read())
{
pers = new Persoon();
pers.ID = reader.GetString(0);
pers.Naam = reader.GetString(1);
pers.Voornaam = reader.GetString(2);
pers.Leeftijd = reader.GetInt32(3);
}
}
return pers;
}
LINQ result:
SQL result:
Thank you for helping me, I grealy appreciate it!
Thomas
You get that particular exception by trying to reference the "e.Result" property when it's not valid, i.e., when the method call returned an exception instead of a value. Before you reference e.Result, confirm that e.Error == null, and if it doesn't, indulge yourself in some error handling or messaging code, e.g.:
void client_GetPersoonByIDCompleted(object sender, GetPersoonByIDCompletedEventArgs e)
{
if (e.Error != null)
{
MessageBox.Show("An error occurred: " + e.Error.ToString());
}
else
{
label1.Content = e.Result;
}
}
Or something of that sort.