Call form load event in another function - c#

I need advice on how to call the form load at other areas in my code to avoid excess copy and paste. I basically need to load the page at other areas after pressing buttons in an interface. I need all of the code that exists and as you can see it is quite a bit to copy and paste multiple times.
public void FBinterface_Load(object sender, EventArgs e)
{
txtSerial.Focus();
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string SerialQuery = "select SerialNumber from Inventory";
command.CommandText = SerialQuery;
//TO READ DATA
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
comboSerial.Items.Add(reader["SerialNumber"]);
}
connection.Close();
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Message);
connection.Close();
}
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string PartQuery = "select PartNumber from Inventory";
command.CommandText = PartQuery;
//TO READ DATA
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
comboPart.Items.Add(reader["PartNumber"]);
}
connection.Close();
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Message);
connection.Close();
}
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string ROnumberQuery = "select ROnumber from Inventory";
command.CommandText = ROnumberQuery;
//TO READ DATA
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
comboRO.Items.Add(reader["ROnumber"]);
}
connection.Close();
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Message);
connection.Close();
}
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string LocationQuery = "select Location from Inventory";
command.CommandText = LocationQuery;
//TO READ DATA
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
comboLocation.Items.Add(reader["Location"]);
}
connection.Close();
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Message);
connection.Close();
}
}


Move your logic to another method and call it when you want
public void FBinterface_Load(object sender, EventArgs e)
{
MyLogic();
}
private void MyLogic()
{
txtSerial.Focus();
try
{
//removed for brevity
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Message);
connection.Close();
}
}
now call MyLogic method when you want.
For example:
public void button1_Click(object sender, EventArgs e)
{
//some code
MyLogic(); //calling the whole logic you want.
//extra code
}


Did you try:
FBinterface_Load(this,null);

Related

Can't select numerical values from database into a TextBox

I want to use a combobox to retrieve data from an access database, but it doesn't work with numerical values.
This part of the code is the connection string and object:
public partial class StockControl : Form
{
OleDbConnection connection = new OleDbConnection();
public StockControl()
{
InitializeComponent();
connection.ConnectionString = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Folder\NewStockControl.mdb;Persist Security Info=False;";
}
Here is the code I used to retrieve the field ProductName in the Access database (StockControl is the name of the form I created):
private void StockControl_Load(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "select ProductName from Products";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
cbProductId.Items.Add(reader["ProductName"].ToString());
}
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error" + ex);
}
}
And here is the code I added to the combo box (cbProductId)
private void cbProductId_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.CommandType = CommandType.Text;
command.Connection = connection;
string query = "SELECT * from Products WHERE ProductName='"+cbProductId.Text+"'";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
txtStockName.Text = reader["ProductName"].ToString();
txtStockQty.Text= reader["SupplyLeft"].ToString();
}
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error" + ex);
}
}
There are two textboxes in the StockControl form: txtStockName and txtStockQty, and I want the fields ProductName and SupplyLeft to be displayed in those textboxes respectively. However whenever I run the code the only value that shows is ProductName, but SupplyLeft doesn't. I assume it has to do with the fact that it is an integer rather than a string, but I don't know how to convert the text box to be able to display the value SupplyLeft.

How to save an image database and display it on a panel on webpage?

I created a folder on a webform in visual studio for images and titled as (Invoices), I want to save the root of images in MySql database and display the images on a panel one the webpage. The image has been saved on the folder but not on database.
The Codes I have tried
protected void Page_Load(object sender, EventArgs e)
{
string connection = "server=localhost; userid= ; password= ; database=admindb; allowuservariables=True";
MySqlConnection cn = new MySqlConnection(connection);
try
{
string sqlcmd = "SELECT PicAddress FROM InvoicesFP WHERE InvoicesFP_ID=#InvoicesFP_ID";
cn.Open();
MySqlCommand cmd = new MySqlCommand(sqlcmd, cn);
cmd.CommandType = CommandType.Text;
MySqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
string url = rdr["PicAddress"].ToString();
Image1.ImageUrl = url;
}
}
catch (Exception ex)
{
throw ex;
}
cn.Close();
}
protected void Button1_Click(object sender, EventArgs e)
{
#region fileupload
var FileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName).Substring(1);
string SaveLocation = Server.MapPath("Invoices\\") + Guid.NewGuid().ToString("N") + FileExtension;
MySqlConnection connection = new MySqlConnection("server=localhost; userid=root; password=admin1234; database=admindb; allowuservariables=True");
MySqlCommand cmd = new MySqlCommand();
cmd.CommandText = "insert into invoicesfp (PicAddress), VALUES (#PicAddress)";
cmd.CommandType = CommandType.Text;
cmd.Connection = connection;
cmd.Parameters.AddWithValue("PicAddress", Server.MapPath("~/Invoices"));
cmd.Connection.Open();
cmd.BeginExecuteNonQuery();
cmd.Connection.Close();
try
{
FileUpload1.PostedFile.SaveAs(SaveLocation);
}
catch (Exception ex)
{
if (ex is ArgumentNullException || ex is NullReferenceException)
{
throw ex;
}
}
string PicAddress = "~/Invoices/" + SaveLocation;
}
#endregion
}

Update
Try this Code first, using this sample you do not need to use Rename Method And whatever its Extension is, it is supported:
#region fileupload
var FileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName).Substring(1);
string SaveLocation = Server.MapPath("Invoices\\") + Guid.NewGuid().ToString("N") + "." + FileExtension;
try
{
FileUpload1.PostedFile.SaveAs(SaveLocation);
}
catch (Exception ex)
{
if (ex is ArgumentNullException || ex is NullReferenceException)
{
throw ex;
}
}
string PicAddress = "~/Invoices/" + SaveLocation;
#endregion
MySqlConnection connection = new MySqlConnection("server=localhost; userid=root; password=admin1234; database=admindb; allowuservariables=True");
MySqlCommand cmd = new MySqlCommand();
cmd.CommandText = "INSERT INTO InvoicesFP (PicAddress) VALUES (#PicAddress)";
cmd.CommandType = CommandType.Text;
cmd.Connection = connection;
cmd.Parameters.AddWithValue("PicAddress", "PicAddress");
cmd.Connection.Open();
cmd.ExecuteNonQuery();
cmd.Connection.Close();
then in your page_load you can call the Select Query to get the Address out database and pass it over to control e.g:
const string DB_CONN_STR = "Server=etc;Uid=etc;Pwd=etc;Database=etc;";
MySqlConnection cn = new MySqlConnection(DB_CONN_STR);
try {
string sqlCmd = "SELECT PicAddress FROM [YourTable] where Id == PicAddress id";
cn.Open(); // have to explicitly open connection (fetches from pool)
MySqlCommand cmd = new MySqlCommand(sqlCmd, cn);
cmd.CommandType = CommandType.Text;
MySqlDataReader rdr = cmd.ExecuteReader();
while(rdr.Read())
{
string url = rdr["Name of the Field Assuming PicAddress"].ToString();
Image1.ImageUrl = url;
}
}
catch(Exception ex)
{
throw ex;
}
Thats All - Happy Coding

button click to search multiple Access tables

I have a simple feature to search an Access table for a given serial number by button click.
Is there a way to add to what I have below to search multiple tables for the serial number and display in datagridview?
private void searchItembtn_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(serialSearch.Text))
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.Parameters.Add("#searchSerial", OleDbType.VarWChar).Value = serialSearch.Text;
string searchFB = "SELECT * FROM Inventory WHERE SerialNumber = #searchSerial";
command.CommandText = searchFB;
connection.Close();
OleDbDataAdapter db = new OleDbDataAdapter(command);
DataTable dt = new DataTable();
db.Fill(dt);
dataGridFB.DataSource = dt;
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Message);
connection.Close();
}
searchHide();
connection.Close();
}
}

sqlexception was unhandled in c#

I dont know why but when i want to insert image and save , it will be error by SQLException was unhandled (?)
namespace Project
{
class Connection
{
private SqlConnection con;
private string connectString = #"Data Source=.\SQLEXPRESS;AttachDbFilename=" + Application.StartupPath + #"\Database1.mdf;Integrated Security=True;User Instance=True";
private DataTable dTable;
private SqlDataAdapter adapt;
private SqlDataReader read;
private SqlCommand cmd;
public Connection()
{
con = new SqlConnection(connectString);
}
public DataTable executeQuery(string query)
{
try
{
if (con.State != ConnectionState.Closed)
{
con.Close();
}
}
catch(Exception e)
{
MessageBox.Show("Error in database: "+e);
}
con.Open();
dTable = new DataTable();
adapt = new SqlDataAdapter(query, connectString);
adapt.Fill(dTable);
return dTable;
}
public void executeUpdate(string query)
{
try
{
if (con.State != ConnectionState.Closed)
{
con.Close();
}
}
catch (Exception e)
{
MessageBox.Show("Error in database: " + e);
}
con.Open();
cmd = con.CreateCommand();
cmd.CommandText = query;
read = cmd.ExecuteReader(); // this is the error
}
}
}

You need to call cmd.ExecuteNonQuery() when inserting or updating record, for selecting data cmd.ExecuteReader() is used.
so change this line:
read = cmd.ExecuteReader();
to this:
int NoOfRowsInserted = cmd.ExecuteNonQuery();
See details at MSDN
Also you can see this tutorial

SQL Insert Query Using C#

I'm having an issue at the moment which I am trying to fix. I just tried to access a database and insert some values with the help of C#
The things I tried (worked)
String query = "INSERT INTO dbo.SMS_PW (id,username,password,email) VALUES ('abc', 'abc', 'abc', 'abc')";
A new line was inserted and everything worked fine, now I tried to insert a row using variables:
String query = "INSERT INTO dbo.SMS_PW (id,username,password,email) VALUES (#id, #username, #password, #email)";
command.Parameters.AddWithValue("#id","abc")
command.Parameters.AddWithValue("#username","abc")
command.Parameters.AddWithValue("#password","abc")
command.Parameters.AddWithValue("#email","abc")
command.ExecuteNonQuery();
Didn't work, no values were inserted. I tried one more thing
command.Parameters.AddWithValue("#id", SqlDbType.NChar);
command.Parameters["#id"].Value = "abc";
command.Parameters.AddWithValue("#username", SqlDbType.NChar);
command.Parameters["#username"].Value = "abc";
command.Parameters.AddWithValue("#password", SqlDbType.NChar);
command.Parameters["#password"].Value = "abc";
command.Parameters.AddWithValue("#email", SqlDbType.NChar);
command.Parameters["#email"].Value = "abc";
command.ExecuteNonQuery();
May anyone tell me what I am doing wrong?
Kind regards
EDIT:
in one other line I was creating a new SQL-Command
var cmd = new SqlCommand(query, connection);
Still not working and I can't find anything wrong in the code above.

I assume you have a connection to your database and you can not do the insert parameters using c #.
You are not adding the parameters in your query. It should look like:
String query = "INSERT INTO dbo.SMS_PW (id,username,password,email) VALUES (#id,#username,#password, #email)";
SqlCommand command = new SqlCommand(query, db.Connection);
command.Parameters.Add("#id","abc");
command.Parameters.Add("#username","abc");
command.Parameters.Add("#password","abc");
command.Parameters.Add("#email","abc");
command.ExecuteNonQuery();
Updated:
using(SqlConnection connection = new SqlConnection(_connectionString))
{
String query = "INSERT INTO dbo.SMS_PW (id,username,password,email) VALUES (#id,#username,#password, #email)";
using(SqlCommand command = new SqlCommand(query, connection))
{
command.Parameters.AddWithValue("#id", "abc");
command.Parameters.AddWithValue("#username", "abc");
command.Parameters.AddWithValue("#password", "abc");
command.Parameters.AddWithValue("#email", "abc");
connection.Open();
int result = command.ExecuteNonQuery();
// Check Error
if(result < 0)
Console.WriteLine("Error inserting data into Database!");
}
}

Try
String query = "INSERT INTO dbo.SMS_PW (id,username,password,email) VALUES (#id,#username, #password, #email)";
using(SqlConnection connection = new SqlConnection(connectionString))
using(SqlCommand command = new SqlCommand(query, connection))
{
//a shorter syntax to adding parameters
command.Parameters.Add("#id", SqlDbType.NChar).Value = "abc";
command.Parameters.Add("#username", SqlDbType.NChar).Value = "abc";
//a longer syntax for adding parameters
command.Parameters.Add("#password", SqlDbType.NChar).Value = "abc";
command.Parameters.Add("#email", SqlDbType.NChar).Value = "abc";
//make sure you open and close(after executing) the connection
connection.Open();
command.ExecuteNonQuery();
}

The most common mistake (especially when using express) to the "my insert didn't happen" is : looking in the wrong file.
If you are using file-based express (rather than strongly attached), then the file in your project folder (say, c:\dev\myproject\mydb.mbd) is not the file that is used in your program. When you build, that file is copied - for example to c:\dev\myproject\bin\debug\mydb.mbd; your program executes in the context of c:\dev\myproject\bin\debug\, and so it is here that you need to look to see if the edit actually happened. To check for sure: query for the data inside the application (after inserting it).

static SqlConnection myConnection;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
myConnection = new SqlConnection("server=localhost;" +
"Trusted_Connection=true;" +
"database=zxc; " +
"connection timeout=30");
try
{
myConnection.Open();
label1.Text = "connect successful";
}
catch (SqlException ex)
{
label1.Text = "connect fail";
MessageBox.Show(ex.Message);
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
String st = "INSERT INTO supplier(supplier_id, supplier_name)VALUES(" + textBox1.Text + ", " + textBox2.Text + ")";
SqlCommand sqlcom = new SqlCommand(st, myConnection);
try
{
sqlcom.ExecuteNonQuery();
MessageBox.Show("insert successful");
}
catch (SqlException ex)
{
MessageBox.Show(ex.Message);
}
}

private void button1_Click(object sender, EventArgs e)
{
String query = "INSERT INTO product (productid, productname,productdesc,productqty) VALUES (#txtitemid,#txtitemname,#txtitemdesc,#txtitemqty)";
try
{
using (SqlCommand command = new SqlCommand(query, con))
{
command.Parameters.AddWithValue("#txtitemid", txtitemid.Text);
command.Parameters.AddWithValue("#txtitemname", txtitemname.Text);
command.Parameters.AddWithValue("#txtitemdesc", txtitemdesc.Text);
command.Parameters.AddWithValue("#txtitemqty", txtitemqty.Text);
con.Open();
int result = command.ExecuteNonQuery();
// Check Error
if (result < 0)
MessageBox.Show("Error");
MessageBox.Show("Record...!", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
con.Close();
loader();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
con.Close();
}
}

public static string textDataSource = "Data Source=localhost;Initial
Catalog=TEST_C;User ID=sa;Password=P#ssw0rd";
public static bool ExtSql(string sql) {
SqlConnection cnn;
SqlCommand cmd;
cnn = new SqlConnection(textDataSource);
cmd = new SqlCommand(sql, cnn);
try {
cnn.Open();
cmd.ExecuteNonQuery();
cnn.Close();
return true;
}
catch (Exception) {
return false;
}
finally {
cmd.Dispose();
cnn = null;
cmd = null;
}
}

I have just wrote a reusable method for that, there is no answer here with reusable method so why not to share...here is the code from my current project:
public static int ParametersCommand(string query,List<SqlParameter> parameters)
{
SqlConnection connection = new SqlConnection(ConnectionString);
try
{
using (SqlCommand cmd = new SqlCommand(query, connection))
{ // for cases where no parameters needed
if (parameters != null)
{
cmd.Parameters.AddRange(parameters.ToArray());
}
connection.Open();
int result = cmd.ExecuteNonQuery();
return result;
}
}
catch (Exception ex)
{
AddEventToEventLogTable("ERROR in DAL.DataBase.ParametersCommand() method: " + ex.Message, 1);
return 0;
throw;
}
finally
{
CloseConnection(ref connection);
}
}
private static void CloseConnection(ref SqlConnection conn)
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}

class Program
{
static void Main(string[] args)
{
string connetionString = null;
SqlConnection connection;
SqlCommand command;
string sql = null;
connetionString = "Data Source=Server Name;Initial Catalog=DataBaseName;User ID=UserID;Password=Password";
sql = "INSERT INTO LoanRequest(idLoanRequest,RequestDate,Pickupdate,ReturnDate,EventDescription,LocationOfEvent,ApprovalComments,Quantity,Approved,EquipmentAvailable,ModifyRequest,Equipment,Requester)VALUES('5','2016-1-1','2016-2-2','2016-3-3','DescP','Loca1','Appcoment','2','true','true','true','4','5')";
connection = new SqlConnection(connetionString);
try
{
connection.Open();
Console.WriteLine(" Connection Opened ");
command = new SqlCommand(sql, connection);
SqlDataReader dr1 = command.ExecuteReader();
connection.Close();
}
catch (Exception ex)
{
Console.WriteLine("Can not open connection ! ");
}
}
}

Categories