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Insert does not working on Service Based Database in C#

I have created a service based database in visual studio 2017. It works with a select statement but INSERT statement doesn't work. Here is my code.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Configuration;
using System.Data.SqlClient;
namespace RestaurantApp
{
public partial class Form1 : Form
{
SqlConnection conn = new SqlConnection(#"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\SerinCafe.mdf;Integrated Security=True");
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
conn.Open();
SqlCommand cmd = new SqlCommand("INSERT INTO Product (Id, ProductDescription, UnitPrice, SystemDate) Values (1,'Çay', 1, '01.01.2017')", conn);
cmd.ExecuteNonQuery();
SqlCommand cmd1 = new SqlCommand("SELECT * FROM Product", conn);
SqlDataAdapter da = new SqlDataAdapter(cmd1);
DataTable dt = new DataTable();
da.Fill(dt);
conn.Close();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
Application.Exit();
}
I saw the same problem on different topics but there wasn't a clear solution that applies for me.
EDIT: On the SQL Server Object Explorer there is another database under the folder debug/bin. Now I checked it and I saw that data is inserted as I wanted. But it doesn't stay same. I changed the sql query as id = 3 and checked again. Previous data has gone. Newly inserted data is only there.

I have tested the code it works fine.Make sure you provided the connection string correctly.

C#: MySQL Exception was unhandled

An unhandled exception of type MySql.Data.MySqlClient.MySqlException occurred in MySql.Data.dll
Additional information:
Access denied for user 'groupdes_ling'#'60.50.32.226' (using password: YES)
This error occurs whenever i'm trying to run my program. The coding is pasted below:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace GroupDesignProject
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
string MyConnectionString = "Server=31.220.105.189;Database=groupdes_GDP;Uid=groupdes_ling;Pwd=0164851286;";
MySqlConnection connection = new MySqlConnection(MyConnectionString);//create connection
MySqlCommand cmd;
connection.Open();//connect to database
//write INSERT command and execute
cmd = connection.CreateCommand();//create command
cmd.CommandText = "INSERT INTO trial (Name)values ('" + textBox1.Text + "');";
cmd.ExecuteNonQuery();
//disconnect from database
if (connection.State == ConnectionState.Open)
{
connection.Close();
}
}
}
}
I still can't manage to solve this error. Thanks for the help

You need to add permissions for that user/host/password combination to the MySQL instance. For example;
GRANT ALL ON *.* to 'groupdes_ling'#'60.50.32.226' IDENTIFIED BY 'Password';

Access DB not displaying in DataGridView in C#

This is driving me nuts. I've seen other responses to this type of question but it hasn't helped. I created a simple Access db and want to display the tables in a datagrid. I've created something similar which worked yet when I try it with this, it won't display. How can I check if the connection is actually working? Code being used is
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.Data.OleDb;
namespace CAStock
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private DataTable dTable = new DataTable();
private void Form1_Load(object sender, EventArgs e)
{
string sqlStr = "SELECT * FROM Products";
updateDataGrid(sqlStr);
}
private void updateDataGrid(String pSqlStr)
{
string connStr = "Provider = Microsoft.ACE.OLEDB.12.0;" + "Data Source = Stock.accdb";
OleDbDataAdapter dAdapter = new OleDbDataAdapter(pSqlStr,connStr);
dTable.Clear();
dAdapter.Fill(dTable);
dAdapter.Dispose();
dgvStock.DataSource = dTable;
}
}
}

Edit database in management studio using visual studio c#

I have created a database using SQL Server Management Studio and am now trying to edit that database using Visual Studio Express 2012. I have connected the database to Visual Studio and can see my database but I have not been able to edit the database stored in Management Studio using Visual Studio. I have created a form and am trying to insert what is entered into textbox1 into a specific cell on my database after the user defines the column name and row (using the primary key in my DB) with textbox2 and textbox3. What code can I use to perform this action? So far I have had no luck. Thank you in advance for you help.
This is my current code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data.Sql;
using Microsoft.SqlServer.Server;
using System.Data.Linq;
using System.Data.Linq.Mapping;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
SqlConnection myConnectionString = new SqlConnection("Data Source=Server Catalog=DataBase;Integrated Security=True");
SqlCommand command = new SqlCommand();
private void maskedTextBox1_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
{
}
private void button3_Click(object sender, EventArgs e)
{
try
{
using (SqlConnection dbConnection = new SqlConnection()) // the "using" construct will close and dispose of the connection
{
dbConnection.ConnectionString = ("Data Source=Server ;Initial Catalog=Database;Integrated Security=True");
dbConnection.Open();
maskedTextBox1.Clear();
dateTimePicker1.Value = DateTime.Now.AddDays(0);
comboBox1.SelectedIndex = -1;
String username = comboBox2.Text;
using (SqlCommand command = new SqlCommand("INSERT INTO [Table Name] (Column Name) VALUES ([Parm1])", dbConnection))
{
command.Parameters.AddWithValue("Parm1", username);
command.ExecuteNonQuery();
}
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
private void button1_Click(object sender, EventArgs e)
{
this.Close();
}
private void button2_Click(object sender, EventArgs e)
{
//Close the Window
this.Close();
}
private void label4_Click(object sender, EventArgs e)
{
}
private void comboBox1_DataSourceChanged(object sender, EventArgs e)
{
}
private void button4_Click(object sender, EventArgs e)
{
myConnectionString.Open();
MessageBox.Show("Sql is connected");
myConnectionString.Close();
}
}
}

The VALUES clause should specify a parameter and that parameter should be specified when adding the parameter value. Try substituting the following:
String sqlquery = "INSERT INTO [Man Power] ([Person_Performing_Phase_2]) VALUES ([Parm1])";
SqlCommand command = new SqlCommand(sqlquery, con);
command.Parameters.AddWithValue("Parm1", username);
EDIT
Your connection string is incorrectly formed. I believe the following format is appropriate for your current needs:
String myConnectionString = Server=myServerAddress;Database=myDataBase;Trusted_Connection=True;
I would use the following code for inserting data, which opens and closes the connection for each operation. Note the "command.ExecuteNonQuery" statement - its omission is why your insert failed to work - although I am unsure why opening the connection did not throw an error.
private void button3_Click(object sender, EventArgs e)
{
try
{
using (SqlConnection dbConnection = new SqlConnection()) // the "using" construct will close and dispose of the connection
{
dbConnection.ConnectionString = myConnectionString;
dbConnection.Open();
maskedTextBox1.Clear();
dateTimePicker1.Value = DateTime.Now.AddDays(0);
comboBox1.SelectedIndex = -1;
String username = comboBox2.Text;
using (SqlCommand command = new SqlCommand("INSERT INTO [Man Power] ([Person_Performing_Phase_2]) VALUES ([Parm1])", dbConnection))
{
command.Parameters.AddWithValue("Parm1", username);
command.ExecuteNonQuery();
}
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
You should also remove all other _Click methods and replace the connection and command statement with the myConnectionString assignement.

Oracledependency event is not firing

I have some problems using OracleDependency.
I've read docs on msdn and oracle and copy some code to try it.
However this is not working, the event on_my_event doesn't fire when the insert is done.
Does anyone know why ?
My user has CHANGE NOTIFICATION rights on the database. Oracle Server is 11.2.0.3.0.
Here is the code :
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 Oracle.DataAccess.Client;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
string connection_string = "Data Source=My_srv;User Id=My_usr;Password=My_pwd;";
OracleConnection connection = null;
OracleDependency dependency = null;
OracleCommand my_select = null;
OracleCommand my_insert = null;
public Form1()
{
InitializeComponent();
}
private void TB_insert_event(object sender, EventArgs e)
{
if (TB_insert.Text == "Name of your insert")
TB_insert.Clear();
}
private void insert(object sender, EventArgs e)
{
connection = new OracleConnection(connection_string);
my_insert = connection.CreateCommand();
my_insert.CommandText = "INSERT INTO USR_DEV_TRUNK.WPARAM (wpa_codeparam) VALUES ('" + TB_insert.Text + "')";
connection.Open();
my_insert.ExecuteNonQuery();
connection.Close();
}
private void Set_dep(object sender, EventArgs e)
{
OracleDependency.Port = 3048;
connection = new OracleConnection(connection_string);
connection.Open();
my_select = connection.CreateCommand();
my_select.CommandText = "SELECT wpa_codeparam FROM USR_DEV_TRUNK.WPARAM";
dependency = new OracleDependency();
dependency.AddCommandDependency(my_select);
my_select.Notification.IsNotifiedOnce = false;
my_select.ExecuteNonQuery();
dependency.OnChange += new OnChangeEventHandler(on_my_event);
TB_dependency.Text = "The dependency is set, do your insert to see if it works";
connection.Close();
}
public void on_my_event(object obj, OracleNotificationEventArgs arg)
{
TB_dependency.Text = "Yay ! It worked !";
}
}
}
I have two buttons :
One to set my dependency (function (on click) : Set_dep)
One to do my insert (function (on click) : insert)
And i have two textboxs :
One to get my insert (name : TB_insert)
One to show the dependency state (name : TB_dependency)

Did you make sure packets on port 3048 are not getting blocked by a firewall?
Also, once your dependency has been set, can you see it by querying the USER_CHANGE_NOTIFICATION_REGS / DBA_CHANGE_NOTIFICATION_REGS views?