Search DaniWeb - datacolumns

DataColumn not being assigned to array in loop 14 Years Ago by hjdoran … on as needed. All the relationship require multiple datacolumns so I pass arrays of datacolumns for the parent and child tables. Problem…: My problem stems from trying to populate an array of datacolumns. I pass in a list of fields to be used… DataGridView Column Cell Style Formatting 16 Years Ago by solo17 … instantiated of type DataSet. I've proceeded to create new DataColumns and add them to the DataSet before I populate the… I haven't been able to do that for the DataColumns that I've created and added to the DataSet. The… Calculated columns in a DataTable? 16 Years Ago by fishsqzr … to use C# methods to set the values of some DataColumns in a table. DataColumn provides an Expression property, but that… Add a query in crystal report. 13 Years Ago by domingo … problem is that i cannot find have to fill the datacolumns with the value of the datareader. [CODE] DatabaseConnection.conn.Open… Re: Add a query in crystal report. 13 Years Ago by sknake … problem is that i cannot find have to fill the datacolumns with the value of the datareader.[/B] I don't… Error while convert C# to VB 12 Years Ago by zoro20002 … As Object, ByVal e As EventArgs) DataFilter2.DataSource = SqlDataSource2 DataFilter2.DataColumns = GridView1.Columns DataFilter2.FilterSessionID = "Default.aspx" DataFilter2.OnFilterAdded… Re: Need help with error 13 Years Ago by Lusiphur … datatable foreach (DataRow row in dt.Rows) { // Cycle through the DataColumns (you've only made one DataColumn // which is the equivalent… table was set up that your attempt at cycling through datacolumns within datarows may be performing an 'illegal' operation with data… Re: How to make loan settlement data grid view in vb.net 8 Years Ago by tinstaafl … for the table is called DataTable. The columns are called DataColumns and the rows with data are DataRows. These classes are… table are: * Instantiate a new DataTable * Add the appropriately named DataColumns * For each row of data create a new DataRow with… Re: Viewing Data in Datagrid 15 Years Ago by 4advanced … studio for sql-express. Connect to a table, read the datacolumns into a gridview and so on...It's really not… Re: Accept null value 13 Years Ago by speedcat Hi, so you're saying change AllowDBNull to True, or change it to False? My datatable has all the DataColumns set to True, however whenever I pull a NULL value from SQL, I get an Exception in the GET Method. WTF? This is pretty lame if you ask me... strongly typed but so strongly that you cannot handle NULLs. Re: Can I get some feedback / mentoring? 13 Years Ago by nick.crane … for multiple DataRows. Each DataRow contains the data for the DataColumns associated with its parent DataTable. For most simple queries the… Re: Adding a new row in a Datagrid ??????????? 13 Years Ago by navyjax2 I found out you have to first create DataColumns and make their ReadOnly property equal to false (dc = new … Re: VB.Net DateTimePicker 13 Years Ago by crapulency …: If you ensure default values - in your db and datatable datacolumns - or explicitly assigning values on adding rows - so you never… Re: Confusion in data adapter fill method process 13 Years Ago by abelLazm … line like you don't need to set Datatables or datacolumns when you fill your dataset [ICODE] DbAdapter.Fill(dataSet1, tblName… Re: dataset query connection string?? 11 Years Ago by G_Waddell ….Tables(1) 'need to hook into the actual columns as datacolumns Dim parentColumn As DataColumn = DTColors.Columns("ColorID") Dim… Re: Return alll rows from column in datatable 8 Years Ago by JOSheaIV … Extensions in relation to DataTables (as well as DataRows and DataColumns) /// </summary> public static class DataTableExtensions { #region ColumnToArray /// <… dataset add relation datacolumns dynamically 18 Years Ago by cpopham Okay this is a good one I believe. In a dataset, you can create single relations (ParentTable.PrimaryKey to ChildTable.ForignKey) using the dataset.relations.add method. You can use a string variable something like this: Dataset.Relations.Add("relationName",Dataset.ParentTable.columns(strParentKey),dataset.ChildTable.columns(… Re: Calculated columns in a DataTable? 16 Years Ago by alc6379 Would it perhaps be possible to modify your SQL query to do the work for you? You could do the initial query, then do a UNION ALL using the query that does the calculations. That way, you would have one single result set, and the last row should be the calculations that you require. I can't think of any other way to do what you're asking, aside… Re: Calculated columns in a DataTable? 16 Years Ago by fishsqzr My applications are targeted to aquatic sciences, and some of the logic and equations involved are not the kind of thing you'd want to do in SQL. Also, I need to keep open the option of handling alternate databases which do not support the operations required, or even stored procedures at all. So, I guess the way I'm doing it is all that can be… Re: Add a query in crystal report. 13 Years Ago by kvprajapati [code] rep.SetDataSource(ds); [/code] Re: Add a query in crystal report. 13 Years Ago by domingo thanks for the fast reply but i want to edit the data column value of the dataset. is it possible? Re: Add a query in crystal report. 13 Years Ago by kvprajapati [b]>i want to edit the data column value of the dataset. is it possible?[/b] Yes. [code] ds.Tables["Product"].Rows[0]["Put_columnName"]=value_here; rep.SetDataSource(ds); [/code] Re: Add a query in crystal report. 13 Years Ago by domingo still not working Re: Add a query in crystal report. 13 Years Ago by domingo thanks solved my problem Re: Error while convert C# to VB 12 Years Ago by hericles You need to read and understand the concepts here: [url]http://msdn.microsoft.com/en-us/library/wkzf914z%28v=vs.71%29.aspx[/url] This explains events and how they are raised. Re: Error while convert C# to VB 12 Years Ago by GeekByChoiCe [CODE=vb] AddHandler DataFilter2.OnFilterAdded , AddressOf DataFilter2_OnFilterAdded [/CODE]