خطای System.NullReferenceException: Object reference not set to an instance of an object.

[sherlukholmz]

سلام. من یه برنامه نوشتم. موقع دیباگ کردن با خود ویژوال استودیو خطایی نمی ده. بعد setup ش رو ساختم. موقعی که نصب می کنم و اجرا می کنم و روی دکمه ای که به دیتابیس وصل می شه کلیک می کنم خطا می ده. بقیه ی جاها خطا نمی ده. خطاش هم اینه.

Error.jpg

این هم کدی که توی اون دکمه نوشتم.

loading_img.Visible = true;



            // get the connection string from the config file

            ConnectionStringSettings connStringSettings

            = ConfigurationManager.ConnectionStrings["HealthConnection"];



            // create the connection object

            SqlConnection myConnection

            = new SqlConnection(connStringSettings.ConnectionString)  ;



            // create the SqlDataAdapter

            SqlDataAdapter myAdapter = new SqlDataAdapter(

            "SELECT ID, fileNumber, firstName, lastName, nationalIssue FROM Person where fileNumber like '%" + fileNumber_txt.Text.Trim() + "%' and firstName like '%" + firstName_txt.Text.Trim().Replace("ی", "ي") + "%' and lastName like '%" + lastName_txt.Text.Trim().Replace("ی", "ي") + "%' and nationalIssue like '%" + nationalIssue_txt.Text.Trim() + "%'", myConnection);



            // create the command builder

            SqlCommandBuilder myCommandBuilder = new SqlCommandBuilder(myAdapter);



            // create the DataSet object

            DataSet myDataSet = new DataSet();



            // fill the dataset into the named table

            myAdapter.Fill(myDataSet, "Person");

            table.DataSource = myDataSet.Tables["Person"];



            counter_lbl.Text = table.RowCount.ToString();

            table.Columns[0].Visible = false;

            table.Columns[1].HeaderText = "شماره پرونده";

            table.Columns[2].HeaderText = "نام";

            table.Columns[3].HeaderText = "نام خانوادگی";

            table.Columns[4].HeaderText = "شماره ملی";

            

            table.Visible = true;

            loading_img.Visible = false;



            myConnection.Close();

قست Details هم اینو می گه :

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at Health.Frm_Again.search_btn_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventAr gs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
Health
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///C:/Program%20Files/Coffeenet%20Aseman/Health/Health.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Data
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_32/System.Data/v4.0_4.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel
CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.