Hi my name is vishal for past 7-10 days i have been thinking/breaking my head on how to pass value of variable from datareader execution of one form to another form which inserts that value to a table in sql server 2008 in c# windows forms?
So i am developing an application named:Mini Project,which has a login form named:frmLogin,which also has a mdi parent form named:MDIParent1.Mdi parent form(MDIParent1) also has child forms.
Given below is my c# code of login form(frmLogin):
namespace Mini_Project
{
public partial class frmLogin : Form
{
public int mid;
public int uid = 0;
public frmLogin()
{
InitializeComponent();
}
private void frmLogin_Load(object sender, EventArgs e)
{
}
private bool ManagerUser(string username, string password)
{
bool success = false;
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Select manager_id,manager_first_name from [dbo].[ManagerDetail2] where username='"+txtUsername.Text+"' and password='"+txtPassword.Text+"' and LoginAttempts< 3", conn);
SqlDataReader rd = cmd.ExecuteReader();
while(rd.Read())
{
success=true;
Module.Instance.Manager = Convert.ToInt32(rd[0].ToString());
Module.Instance.GlobalManager = rd[1].ToString();
}
rd.Close();
conn.Close();
return success;
}
private bool ValidateUser(string username, string password)
{
bool success = false;
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Select * from [dbo].[UserDetail2] where username='"+txtUsername.Text+"' and password='"+txtPassword.Text+"' and LoginAttempts< 3", conn);
SqlDataReader rd = cmd.ExecuteReader();
while(rd.Read())
{
success=true;
Module.Instance.User = Convert.ToInt32(rd[0].ToString());
Module.Instance.GlobalUser = rd[1].ToString();
}
rd.Close();
conn.Close();
return success;
}
private void btnLogin_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
if ((txtPassword.Text == "password") && (txtUsername.Text.ToLower() == "admin"))
{
Module.Instance.Admin = 1;
MDIParent1 h = new MDIParent1();
h.Show();
this.Close();
}
else
{
string username = txtUsername.Text;
string password = txtPassword.Text;
bool validUser = ValidateUser(username, password);
bool validmanager = ManagerUser(username, password);
if (validUser)
{
uid = 0;
string name = ("Select user_first_name,user_last_name,user_id from [dbo].[UserDetail2] where username='" + txtUsername.Text + "'");
cmd = new SqlCommand(name);
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
name = dr[0].ToString() + " " + dr[1].ToString()+System.Environment.NewLine+dr[2].ToString();
uid = Convert.ToInt32(dr[2].ToString());
}
dr.Close();
cmd = new SqlCommand("Update [dbo].[UserDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
frmUser u = new frmUser();
Module.Instance.User =u.autoGenId;
MDIParent1 m = new MDIParent1();
m.Show();
this.Close();
}
if (validmanager)
{
string manager = ("Select manager_first_name,manager_last_name,manager_id from [dbo].[ManagerDetail2] where username='" + txtUsername.Text + "'");
cmd = new SqlCommand(manager);
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
SqlDataReader fr = cmd.ExecuteReader();
while (fr.Read())
{
manager = fr[0].ToString() + " " + fr[1].ToString()+System.Environment.NewLine+fr[2].ToString();
mid = Convert.ToInt32(fr[2].ToString());
}
fr.Close();
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
frmManager y=new frmManager();
Module.Instance.Manager =y.bGenId;
MDIParent1 g = new MDIParent1();
g.Show();
this.Close();
}
else
{
cmd = new SqlCommand("Update [dbo].[UserDetail2] set LoginAttempts=LoginAttempts+1 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=LoginAttempts+1 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MessageBox.Show("Invalid user name or password. Please try tomorow ", "Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
txtUsername.Focus();
}
}
}
private void btnCancel_Click(object sender, EventArgs e)
{
Application.Exit();
}The above code works fine! As you can see i login/enter into application(Mini Project) as aadmin using default username:admin and default password:password.
Given below is c# code of class named:Module:
namespace Mini_Project
{
public sealed class Module
{
private static readonly Module _instance = new Module();
public static Module Instance
{
get { return _instance; }
}
public int Admin { get; set; }
public int User { get; set; }
public int Manager { get; set; }
public string GlobalUser { get; set; }
public string GlobalManager { get; set; }
public string GlobalAdmin { get; set; }
}
}
The above code works to some extent only!
So as a admin i create manager for tasks.Given below is c# code of form(frmManager) through which i create manager for tasks and also insert values into table:ManagerDetail2 in sql server 2008 through c# windows forms:
namespace Mini_Project
{
public partial class frmManager : Form
{
public int bGenId = -1;
public frmManager()
{
InitializeComponent();
}
private void frmManager_Load(object sender, EventArgs e)
{
dtDOB.MaxDate = dtDOB.Value.AddYears(-30);
}
private void btnCreate_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Insert into [dbo].[ManagerDetail2](manager_first_name,manager_last_name,manager_dob,manager_sex,email,username,password,status,created_by,LoginAttempts,row_upd_date)" + "Values(@manager_first_name,@manager_last_name,@manager_dob,@manager_sex,@email,@username,@password,@status,@created_by,@LoginAttempts,GetDate()); Select @autoGenId=SCOPE_IDENTITY();", conn);
cmd.Parameters.AddWithValue("@manager_first_name", txtFName.Text);
cmd.Parameters.AddWithValue("@manager_last_name", txtLName.Text);
cmd.Parameters.AddWithValue("@manager_dob", dtDOB.Value);
if (cboSex.SelectedIndex == 0)
{
cmd.Parameters.AddWithValue("@manager_sex", "Male");
}
else if (cboSex.SelectedIndex == 1)
{
cmd.Parameters.AddWithValue("@manager_sex", "Female");
}
else if (cboSex.SelectedIndex == 2)
{
cmd.Parameters.AddWithValue("@manager_sex", "Transgender");
}
cmd.Parameters.AddWithValue("@email", txtEmailID.Text);
cmd.Parameters.AddWithValue("@username", txtUsername.Text);
cmd.Parameters.AddWithValue("@password", txtPassword.Text);
cmd.Parameters.AddWithValue("@status", 1);
cmd.Parameters.AddWithValue("@Created_by", 1);
cmd.Parameters.AddWithValue("@LoginAttempts", 0);
cmd.Parameters.Add("@autoGenId", SqlDbType.Int).Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
bGenId = Convert.ToInt32(cmd.Parameters["@autoGenId"].Value);
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
((MDIParent1)this.MdiParent).updateUserActivities(bGenId, 2, txtFName.Text.ToString() + "Manager detail was added successfully");
MessageBox.Show("Manager Detail was added successfully", "Task", MessageBoxButtons.OK, MessageBoxIcon.Information);
conn.Close();
this.Close();
}The above code works fine with no problems at all!
Given below is structure of table:ManagerDetail2 in sql server 2008:
ColumnName DataType AllowNulls
manager_id(auto-increment primary key) Int No
manager_first_name nvarchar(50) Yes
manager_last_name nvarchar(50) Yes
manager_dob date Yes
manager_sex nvarchar(20) Yes
email nvarchar(60) Yes
username nvarchar(25) Yes
password nvarchar(15) Yes
status bit Yes
created_by Int Yes
LoginAttempts Int Yes
row_upd_date datetime Yes
So using username and password from table:ManagerDetail2 i enter/login into application asmanager(each manager has different manager_id as field:manager_id in table:ManagerDetail2 is auto-increment primary key),create/add new users to application who will come under me/that particular manager only!
Given below is c# code of login form(frmLogin) of how i get value ofmanager_id of currently logged in/entered manager of application:
namespace Mini_Project
{
public partial class frmLogin : Form
{
public int mid;
public frmLogin()
{
InitializeComponent();
}
private void frmLogin_Load(object sender, EventArgs e)
{
}
private bool ManagerUser(string username, string password)
{
bool success = false;
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Select manager_id,manager_first_name from [dbo].[ManagerDetail2] where username='"+txtUsername.Text+"' and password='"+txtPassword.Text+"' and LoginAttempts< 3", conn);
SqlDataReader rd = cmd.ExecuteReader();
while(rd.Read())
{
success=true;
Module.Instance.Manager = Convert.ToInt32(rd[0].ToString());
Module.Instance.GlobalManager = rd[1].ToString();
}
rd.Close();
conn.Close();
return success;
}
private void btnLogin_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
if ((txtPassword.Text == "password") && (txtUsername.Text.ToLower() == "admin"))
{
Module.Instance.Admin = 1;
MDIParent1 h = new MDIParent1();
h.Show();
this.Close();
}
else
{
string username = txtUsername.Text;
string password = txtPassword.Text;
bool validmanager = ManagerUser(username, password);
if (validmanager)
{
string manager = ("Select manager_first_name,manager_last_name,manager_id from [dbo].[ManagerDetail2] where username='" + txtUsername.Text + "'");
cmd = new SqlCommand(manager);
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
SqlDataReader fr = cmd.ExecuteReader();
while (fr.Read())
{
manager = fr[0].ToString() + " " + fr[1].ToString()+System.Environment.NewLine+fr[2].ToString();
mid = Convert.ToInt32(fr[2].ToString());
}
fr.Close();
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MDIParent1 g = new MDIParent1();
g.Show();
this.Close();
}
else
{
cmd = new SqlCommand("Update [dbo].[ManagerDetail2] set LoginAttempts=LoginAttempts+1 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
MessageBox.Show("Invalid user name or password. Please try tomorow ", "Task", MessageBoxButtons.OK, MessageBoxIcon.Warning);
txtUsername.Focus();
}
}As you can see variable named:mid in login form(frmLogin) containsmanager_id of currently logged in manager/entered manager of application(Mini Project) using datareader(named:fr) execution of sqlcommand(named:cmd) in function(validmanager) of btnLogin of login form(frmLogin).
So using username and password from table:ManagerDetail2,i enter/login into application as amanager,create new users to application who will come under me/that particular manager only.Given below is c# code of form(frmUser) through which i create new users to application and also insert values into table:UserDetail2:
namespace Mini_Project
{
public partial class frmUser : Form
{
public int autoGenId = -1;
int man;
public frmUser()
{
InitializeComponent();
frmLogin j = new frmLogin();
j.mid = man;
}
private void btnCreate_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source=NPD-4\\SQLEXPRESS;Initial Catalog=Task;Integrated Security=true");
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd = new SqlCommand("Insert into [dbo].[UserDetail2](user_first_name,user_last_name,user_dob,user_sex,email,username,password,status,row_upd_date,created_by,LoginAttempts)" + "Values(@user_first_name,@user_last_name,@user_dob,@user_sex,@email,@username,@password,@status,GetDate(),@created_by,@LoginAttempts); Select @autoGenId=SCOPE_IDENTITY();", conn);
cmd.Parameters.AddWithValue("@user_first_name", txtFName.Text);
cmd.Parameters.AddWithValue("@user_last_name", txtLName.Text);
cmd.Parameters.AddWithValue("@user_dob", dtDOB.Value);
if (cboSex.SelectedIndex == 0)
{
cmd.Parameters.AddWithValue("@user_sex", "Male");
}
else if (cboSex.SelectedIndex == 1)
{
cmd.Parameters.AddWithValue("@user_sex", "Female");
}
else if (cboSex.SelectedIndex == 2)
{
cmd.Parameters.AddWithValue("@user_sex", "Transgender");
}
cmd.Parameters.AddWithValue("@email", txtEmailID.Text);
cmd.Parameters.AddWithValue("@username", txtUsername.Text);
cmd.Parameters.AddWithValue("@password", txtPassword.Text);
cmd.Parameters.AddWithValue("@status", 1);
cmd.Parameters.AddWithValue("@created_by",man);
cmd.Parameters.AddWithValue("@LoginAttempts", 0);
cmd.Parameters.Add("@autoGenId", SqlDbType.Int).Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
autoGenId = Convert.ToInt32(cmd.Parameters["@autoGenId"].Value);
cmd = new SqlCommand("Update [dbo].[UserDetail2] set LoginAttempts=0 where username='" + txtUsername.Text + "'", conn);
cmd.ExecuteNonQuery();
((MDIParent1)this.MdiParent).updateUserActivities(autoGenId, 1, txtFName.Text + "User detail was added successfully");
MessageBox.Show("User Detail was added successfully", "Task", MessageBoxButtons.OK, MessageBoxIcon.Information);
conn.Close();
this.Close();
}The program executes well some extent only! The problem i am facing is every i execute the program,i am getting value as0 in field:created_by in table:UserDetail2 for all users,even though each user is created by different manager!
Given below is structure of table:UserDetail2 in sql server 2008:
ColumnName
DataType AllowNulls
user_id(auto-increment primary key) Int No
user_first_name nvarchar(50) Yes
user_last_name nvarchar(50) Yes
user_dob date Yes
user_sex nvarchar(20) Yes
email nvarchar(60) Yes
username nvarchar(25) Yes
password nvarchar(15) Yes
status bit Yes
created_by Int Yes
LoginAttempts Int Yes
row_upd_date datetime Yes
What i want is value of variable mid(in login form(frmLogin) which contains value ofmanager_id of currently logged in manager of application(in datareader execution of sql command of functionvalidManager() in btnLogin of login form(frmLogin) to be passed to value of field:created_by in table:UserDetail2 upon creation of new user by that particular manager.
Given below is c# code of mdi parent form(MDIParent1):
namespace Mini_Project
{
public partial class MDIParent1 : Form
{
public MDIParent1()
{
InitializeComponent();
if (Module.Instance.Admin == 1)
{
addNewTaskToolStripMenuItem.Enabled = true;
addUserToolStripMenuItem1.Enabled = true;
addManagerToolStripMenuItem.Enabled = true;
addTaskToolStripMenuItem.Enabled = true;
exitToolStripMenuItem.Enabled = true;
checkInUserToolStripMenuItem.Enabled = false;
tasksToolStripMenuItem.Enabled = true;
optionsToolStripMenuItem.Enabled = true;
pendingTaksToolStripMenuItem.Enabled = true;
completedTasksToolStripMenuItem.Enabled = true;
}
frmManager m = new frmManager();
if (Module.Instance.Manager==m.bGenId)
{
addUserToolStripMenuItem1.Enabled = false;
addManagerToolStripMenuItem.Enabled = true;
addNewTaskToolStripMenuItem.Enabled = false;
addTaskToolStripMenuItem.Enabled = true;
exitToolStripMenuItem.Enabled = true;
checkInUserToolStripMenuItem.Enabled = false;
tasksToolStripMenuItem.Enabled = true;
optionsToolStripMenuItem.Enabled = true;
pendingTaksToolStripMenuItem.Enabled = true;
completedTasksToolStripMenuItem.Enabled = true;
}
frmUser t = new frmUser();
if (Module.Instance.User == t.autoGenId)
{
addManagerToolStripMenuItem.Enabled = false;
addUserToolStripMenuItem1.Enabled = false;
addNewTaskToolStripMenuItem.Enabled = false;
addTaskToolStripMenuItem.Enabled = false;
exitToolStripMenuItem.Enabled = true;
checkInUserToolStripMenuItem.Enabled = true;
tasksToolStripMenuItem.Enabled = false;
optionsToolStripMenuItem.Enabled = false;
pendingTaksToolStripMenuItem.Enabled = false;
completedTasksToolStripMenuItem.Enabled = false;
}
}
public SqlConnectionStringBuilder connBuilder;
public SqlConnection conn;
private void MDIParent1_Load(object sender, EventArgs e)
{
connBuilder = new SqlConnectionStringBuilder();
connBuilder.InitialCatalog = "Task";
connBuilder.DataSource = "NPD-4\\SQLEXPRESS";
connBuilder.IntegratedSecurity = true;
connBuilder.AsynchronousProcessing = true;
conn = new SqlConnection(connBuilder.ToString());
conn.Open();
}So my question is am i going in right track in terms of getting manager_id of currently entered/logged in manager in application?If so tell me what modifications must i need to do in my c# code and where to achieve my required result?
Can anyone help me please! Can anyone help me/guide me to solve my problem! Any help/guidance in solving of this problem would be greatly appreciated!
vishal