Dear , My application is client- server application and one module is used for send file to server application for mail sending purpose. If the user type the mail text than click send button it will save to the database,than it will convert to XML(from Dataset) ,than the file will be zipped than it will pass accros the Dial-up Network.The server will recieve the file and Unzip it ,than the XML file convert to dataset and saved and save to the database .this will work fine but when i want to see the mail .,I opened that mail,that time the appliaction crash and give this error and sometime when i click the mail delete button ,the application crash. can u help me in my case. if u need more info about scenerio,please mail me Error Ocuured In Form : frmMail Error Ocuured In Module : Button10_Click Error Ocuured At Time : 10/4/2005 2:29:24 PM Exception Occured In ITICSMS Server : Message : Object reference not set to an instance of an object. Source : System.Windows.Forms StackTrace : at System.Windows.Forms.SafeNativeMethods.MessageBox(HandleRef hWnd, String text, String caption, Int32 type) at System.Windows.Forms.MessageBox.ShowCore(IWin32Window owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options) at System.Windows.Forms.MessageBox.Show(String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton) at CSMSServer.frmMail.Button10_Click(Object sender, EventArgs e) Explanation : System.NullReferenceException: Object reference not set to an instance of an object. at System.Windows.Forms.SafeNativeMethods.MessageBox(HandleRef hWnd, String text, String caption, Int32 type) at System.Windows.Forms.MessageBox.ShowCore(IWin32Window owner, String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton, MessageBoxOptions options) at System.Windows.Forms.MessageBox.Show(String text, String caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defaultButton) at CSMSServer.frmMail.Button10_Click(Object sender, EventArgs e) ================================================================================ Error Ocuured In Form : MdlStart Error Ocuured In Module : Main Error Ocuured At Time : 10/4/2005 2:29:39 PM Exception Occured In ITICSMS Server : Message : Object reference not set to an instance of an object. Source : System.Windows.F

For sending messages and files over network you can see many articles and you can get refrences that is fully managed .so you can use in your project.if you are in neck. eample :unolibs.Net.dll its vey useful.search here in articls or googling it Ishak

use the system.net.dns refrence u can get many method Ishak

dear All I have to made the data transaction,when the connection will be made ,connections means dial-up network beteween two systems.suppose the system A dialed then the system b will accept the connection and send the file,data to systema .now what i think,i think to create the service when the connection will be made it will activate,now my question is ,how can i know the connection is establishing,means the how cani know the incoming connections is currently connected or not from vb.net and also i want to get both ipaddress.if anybody can help me .thats very usefull for me Ishak

use this format Label.Text = Format(DateTime.Now,"dd'/'MM'/'yyyy hh':'mm':'ss tt") for more format see msdn:) Ishak

Dear All, How can we restict the TextBox to enter only specified language(other than english like arabic or etc..)in vb.net,means that can be access only arabic charecters Ishak

you need to set a returnValue parameter (where the function result will be stored) and execute as "ExecuteNonQuery" Ishak

hello Now WHat u want Exactly Your Programe work Properly as per ur requiste for example If u give h=2 and v= 2 then it will return 2 How BallHt= 2+2*0-16*0*0 remains 2*0-0 remains 2 it will execute in BODMAS order I dont know waht result exactly u want,if u get wrong result change ur formula with brackets the first part u want to execute Ishak

Yes Sumit you can do that dim dr as DataRelation dr = new DataRelation("myRelation",ParaentCol,ChildCol) DataSet.Relations.Add(dr)But in this case u can do only with that dataSet tables itself means if u have two tables in dataset u can make ralationship with the two tables I hope this helps Ishak

Yaa U can do, First u get the Shema Information Of the Table Through DataReder.GetShemaTable So Now u can get the Schema information means column name and datatype etc then in for loop u can give that information to dataGridTablestyles Ishak

Hello It is there There r two methods first one is in ur Datasource table you sholud be craeat the Boolean Column the u give the DataGrid DataSource Datagrid.Datasource = Table (Table with Boolean column) Otherwise create the table style Of DataGrid Dim m_tbs as new DataGridTableStyle with m_tbs dim col as mew DataGridBoolColumn with col .MappingName= ColName // colName is in table which column u want to display .witdh=180 end with .GridColmnStyle.Add(col) end with DataGrid.TableStyles.Add(m_tbs) I hope This will help to u:-D

you can do one thing First you declare the friend or public variable in then you cn call us follows In form1 Write as follows dim frm as new Form2 frm.Showdialog(Me) me.DataGrid = frm.PublicVarDataTable In Form2 Public PublicVarDataTable as datatable OkBut_Click() // add rows in table Me.DialogResult=ok Me.Hide End sub I hope this helps:laugh: Ishak

For some reason, the CurrencyManager will not let me remove the last item in the collection. For example, if I have a CurrencyManager bound to a collection with a Form and Control bound to the CurrencyManager. I can remove any item from the CurrencyManager just fine with RemoveAt. However, if it is the last item , it simply ignores the call. It doesn't throw and error, it simply doesn't do anything. Count remains Same, Position remains 0. Even if I try calling CurrencyManagerVar.List.Clear(), it ignores the call. Again, no error, just doesn't do anything. But in my Another form it has worked fine with CurrencyManager.RemoveAt(CurrencyManger.Position) Any Problem in my code? My code is : CurrencyManager.RemoveAt(CurrencyManager.Position) I have also tried with Dataview.Delete(CurrencyManager.Position) And Dataview.Delete(CurrencyManager.Count-1) And also with DatarowView = CurrencyManager.Current DataTable.Remove(DatarowView.row) above all are not working rugfy

first think u seen ur code, datset doesnot have executereader ,how u exeute the reader from dataset,use the OledbCommandObjecty for execute reader obviously u can get result rugfy

Hello All, In DataSet, How Many records we can store Maximum rugfy

:^)Hai, No ritesh,I have checked thats not the problem,I have given details follws Desc Of my Table in DataBase Name Null? Type ----------------------------------------- -------- ------------- OWNERSHIPTYPEID NOT NULL NUMBER DESCRIPTION NOT NULL VARCHAR2(50) MySql Satament cmdLocal = New OracleClient.OracleCommand("SELECT OWNERSHIPTYPEID,DESCRIPTION FROM OWNERSHIPTYPE", Me.conLocal) My Property Binding Of Control Me.DataSource = dtLocal //DataTable Me.DisplayMember = "DESCRIPTION" Me.ValueMember = "OWNERSHIPTYPEID" This code has given problem,But in another cmbobox like this for another table works fine Rugfy

:)In .Net When you Load the Recordset to datatable.If you set source of data to controls like listbox or combobox some times the datas are not viewed instead of In control we see the form of System.Data.DataRowView(It happenes only in sometime not all time )but we can avoid it through dataview For example dim dt as datatable Adapter.Fill(dt) ComboBox.Datasource = dt ComboBox.DisplayMember="Column1" ComboBox.ValueMember = "Column2" // In my case Display member displays record well but problem in Valuemember only i got as system.Data.DataRowView you can avoid this in DirectCasting of DatarowView Otherwise dim dv as dataview = dt.DefaultView ComboBox.Datasource = dv ComboBox.DisplayMember="Column1" ComboBox.ValueMember = "Column2" // Now works fine Otherwise you can directly give as ComboBox.Datasource = dt.Defaultview ComboBox.DisplayMember="Column1" ComboBox.ValueMember = "Column2" // Now works fine I dont know why its happened,If anybody knows ,Let inform here Rugfy Rugfy

:^)In .Net When you Load the Recordset to datatable.If you set source of data to controls like listbox or combobox some times the datas are not viewed instead of In control we see the form of System.Data.DataRowView(It happenes only in sometime not all time )but we can avoid it through dataview For example dim dt as datatable Adapter.Fill(dt) ComboBox.Datasource = dt ComboBox.DisplayMember="Column1" ComboBox.ValueMember = "Column2" // In my case Display member displays record well but problem in Valuemember only i got as system.Data.DataRowView you can avoid this in DirectCasting of DatarowView Otherwise dim dv as dataview = dt.DefaultView ComboBox.Datasource = dv ComboBox.DisplayMember="Column1" ComboBox.ValueMember = "Column2" // Now works fine Otherwise you can directly give as ComboBox.Datasource = dt.Defaultview ComboBox.DisplayMember="Column1" ComboBox.ValueMember = "Column2" // Now works fine I dont know why its happened,If anybody knows ,Let inform here Rugfy

Thanx a Lot But I don't need it ,My actual Think is i want to give the distance between two pages like seperator in toolbar for some elegant look.thats all.In this case my doubt is whats the use of Tabcontrol.Tabpages(0).Vaiable = False Does it doing nothing Thats Why Any way Once Thanx For your reply Ishak

Dear all, Anyone can hide the tabpages in tabcotrol Don't tell follows Me.TabControl1.TabPages.Item(0).Visible = False This is not working And also can you draw line on tabpages rugfy Ishak