The DataKeyNames field will be used in the SQL query to edit the employee details. If conn.State ConnectionState.Closed Then conn. To edit data in a particular row, add AutoGenerateEditButton and set DataKeyNames'EmpID' to the GridView control. When the Button to get the selected rows of GridView is clicked, a loop will be executed over the GridView rows and all the rows whose CheckBox is checked will be marked as selected and will be copied to another GridView.
#GRIDVIEW VB NET 2010 HOW TO#
MsgBox(“There was an error loading the database: ” & myerror.Message) Here Mudassar Ahmed Khan has explained with an example, how to get the selected rows of GridView using CheckBox in ASP.Net with C and VB.Net. I have made a project in visual basic 2010 and sql server, i want to update the record in party master in another form, where when i click on the update button the another update form will open and there in the dtagrid all the records of data table will present, on that form there is three button, update, delete, cancel, i just want that when i click on the update button after editing the. Public Function GetDataTable(ByVal SQL As String) As DataTable Row.Cells(“Icon”).Value = My.Resources.Gnome_Dialog_Question_16 ‘Set picture for rows of our columnĭgv.Columns(“Icon”).DefaultCellStyle.NullValue = My.Resources.Gnome_Dialog_Question_16 (“Icon”, GetType(Image)).SetOrdinal(0) ‘Set our new column to the first order of the tableįor Each row As DataGridViewRow In dgv.Rows The GridView control supports the following features: Binding to data source controls, such as SqlDataSource. Each column represents a field, while each row represents a record. Update: I set null value for the column in datagridview instead of setting value in every row.ĭim myData as DataTable = GetDataTable(“SELECT id, value FROM uln_kuesioner ORDER BY id”) The GridView control is used to display the values of a data source in a table. So to do this, I instead set the image value from cells of the datagridview. The exception says that the datavalue () is not match with the the type of the column ( System.Drawing. I got an error when setting defaultvalue of the column to an image from Resources (a Bitmap). I added the column directly to the Datatable instead of datagridview, then I bind the datagridview to the datatable Note: The HTML markup is not cached when using this technique.This is the way that use to add an image column to a bounded datagridview.
When the cache expires, the Select method retrieves data from the business object, and then caches the data again.ĭepending on your application, this simple trick can improve the performance of your application.
While data is cached, calls to the Select method retrieve data from the cache rather than the ObjectDataSource creating an instance of the business object and calling its data method. If GridView is bound to ObjectDataSource Īs quoted in the MSDN documentation: The ObjectDataSource control supports data caching. When the cache expires, the Select method retrieves data from the underlying database, and then caches the data again. While data is cached, the Select method retrieves data from the cache rather than from the underlying database. SelectCommand ="SELECT, FROM "ĮnableCaching ="true" CacheDuration ="3000" >Īs quoted in the MSDN documentation: The SqlDataSource control supports data caching.
Here’s how to do it using the SqlDataSource.EnableCaching and ObjectDataSource.EnableCaching property respectively: So in order to enable caching on an ASP.NET GridView, use data caching on the DataSource. However if the GridView has paging enabled on a page that uses OutputCaching and you try to navigate through the pages, you will find that the GridView behaves erratically. I use the unique primary key in the datagridview as not visible so once the row is selected, i can get that integer and populate the textbox by using another database query.
Now if you have an ASP.NET Page with a UserControl containing a GridView, and you have enabled OutputCaching on the entire page, then the functionality will work as expected, if the GridView does not have paging enabled. Im trying to display data in a datagrid then once a row is selected show a different column of the database in a text box. When it comes to caching data in the GridView, most developers do the mistake of caching the entire page. Continuing my ASP.NET GridView Tips and Tricks series, here’s another one that shows how to adopt a caching mechanism in the ASP.NET GridView.
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