Comments by karteekboddu (Top 20 by date)

yes i did that but i m facing this error

Yes i have added

Yes like fast colored textbox dll

I ran app by keeping break point but it is not throwing any error.
But in runtime its giving exception like OBJECT REFERENCE NOT SET TO INSTANCE OF OBJECT or
some times ARGUMENT EXCEPTION UNHANDLED like INDEX WAS OUT OF RANGE

Sorry,
public Login()
{

InitializeComponent();
this.txtPassword.KeyPress += new KeyPressEventHandler(CheckKeys);
}

private void CheckKeys(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)
{

try
{
string user = txtUser.Text.ToString();

//Constructing connection string from the inputs
if (user == "SYS" || user == "sys" || user == "sys as sysdba")
{
StringBuilder Con = new StringBuilder("Data Source=");
Con.Append(txtTns.Text);
Con.Append(";User ID=");
Con.Append(txtUser.Text);
Con.Append(";Password=");
Con.Append(txtPassword.Text);
Con.Append(";DBA Privilege=SYSDBA");
string strCon = Con.ToString();
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
connectionStringsSection.ConnectionStrings["con"].ConnectionString = strCon;
connectionStringsSection.ConnectionStrings["newcon"].ConnectionString = strCon;
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");
// updateConfigFile(strCon);

ConfigurationManager.RefreshSection("connectionStrings");

}
else
{
StringBuilder Con1 = new StringBuilder("Data Source=");
Con1.Append(txtTns.Text);
Con1.Append(";User ID=");
Con1.Append(txtUser.Text);
Con1.Append(";Password=");
Con1.Append(txtPassword.Text);

string strCon1 = Con1.ToString();
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
connectionStringsSection.ConnectionStrings["con"].ConnectionString = strCon1;
connectionStringsSection.ConnectionStrings["newcon"].ConnectionString = strCon1;
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");

}
//QBHomep home = new QBHomep();
QueryBuilder home = new QueryBuilder();
this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
home.Show();
this.Hide();
}
catch (Exception E)
{
MessageBox.Show(ConfigurationManager.ConnectionStrings["con"].ToString() + ".This is invalid connection", "Incorrect server/Database");
}
}

This was the code from Login class

private void btnLogin_Click(object sender, EventArgs e)
{
try
{

string user = txtUser.Text.ToString();

//Constructing connection string from the inputs
if (user == "SYS" || user == "sys" || user == "sys as sysdba")
{
StringBuilder Con = new StringBuilder("Data Source=");
Con.Append(txtTns.Text);
Con.Append(";User ID=");
Con.Append(txtUser.Text);
Con.Append(";Password=");
Con.Append(txtPassword.Text);
Con.Append(";DBA Privilege=SYSDBA");
string strCon = Con.ToString();
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
connectionStringsSection.ConnectionStrings["con"].ConnectionString = strCon;
connectionStringsSection.ConnectionStrings["newcon"].ConnectionString = strCon;
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");
// updateConfigFile(strCon);

ConfigurationManager.RefreshSection("connectionStrings");

}
else
{
StringBuilder Con1 = new StringBuilder("Data Source=");
Con1.Append(txtTns.Text);
Con1.Append(";User ID=");
Con1.Append(txtUser.Text);
Con1.Append(";Password=");
Con1.Append(txtPassword.Text);

string strCon1 = Con1.ToString();
var config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var connectionStringsSection = (ConnectionStringsSection)config.GetSection("connectionStrings");
connectionStringsSection.ConnectionStrings["con"].ConnectionString = strCon1;
connectionStringsSection.ConnectionStrings["newcon"].ConnectionString = strCon1;
config.Save();
ConfigurationManager.RefreshSection("connectionStrings");

}
//QBHomep home = new QBHomep();
QueryBuilder home = new QueryBuilder();
this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
home.Show();
this.Hide();
}
catch (Exception E)
{
MessageBox.Show(ConfigurationManager.ConnectionStrings["con"].ToString() + ".This is invalid connection", "Incorrect server/Database");
}
}

public void updateConfigFile(string con)
{
//updating config file
XmlDocument XmlDoc = new XmlDocument();
//Loading the Config file
string path = "..\\..\\App.config";
XmlDoc.Load(path);
foreach (XmlElement xElement in XmlDoc.DocumentElement)
{
if (xElement.Name == "connectionStrings")
{
//setting the coonection string
xElement.FirstChild.Attributes[1].Value = con;
xElement.LastChild.Attributes[1].Value = con;

}
}
//writing the connection string in config file
XmlDoc.Save(path);


}

private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
}


//protected override void OnPaintBackground(PaintEventArgs e)
//{
// using (LinearGradientBrush brush = ne

Application.Run(new Login());

I used ex.message
ex.Message = "Object reference not set to an instance of an object."

No i didnt had gridview in login form

at System.Windows.Forms.DataGridViewRowHeaderCell.PaintPrivate(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, DataGridViewElementStates dataGridViewElementState, Object formattedValue, String errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts, Boolean computeContentBounds, Boolean computeErrorIconBounds, Boolean paint)
at System.Windows.Forms.DataGridViewRowHeaderCell.Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, DataGridViewElementStates cellState, Object value, Object formattedValue, String errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
at System.Windows.Forms.DataGridViewCell.PaintWork(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, DataGridViewElementStates cellState, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
at System.Windows.Forms.DataGridViewRow.PaintHeader(Graphics graphics, Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow, DataGridViewPaintParts paintParts)
at System.Windows.Forms.DataGridViewRow.Paint(Graphics graphics, Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow)
at System.Windows.Forms.DataGridView.PaintRows(Graphics g, Rectangle boundingRect, Rectangle clipRect, Boolean singleHorizontalBorderAdded)
at System.Windows.Forms.DataGridView.PaintGrid(Graphics g, Rectangle gridBounds, Rectangle clipRect, Boolean singleVerticalBorderAdded, Boolean singleHorizontalBorderAdded)
at System.Windows.Forms.DataGridView.OnPaint(PaintEventArgs e)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.DataGridView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at AISQBTool.Program.Main() in C:\Users\AISC01\Desktop\AISQBTool_11-2-13_integrated\AISQBTool_11-2-13_integrated\AISQBTool\Program.cs:line 22

yes i had

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;


namespace AISQBTool
{
static class Program
{
///

/// The main entry point for the application.
///

[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Login());
}
}
}

Thankyou,

Could you please provide with one example code.

Thankyou for your solution,

Could you please provide some example code