Bind RadGridView to DataTable programatically

[Greg]

Hello,

 

I'm trying to use RadGridView to export a datatable to Excel.  I've created a method that takes a datatable as a parameter, creates a RadGridView, sets the dataSource to the datatable, and then exports.  Problem is that the RadGridview doesn't seem to be getting populated with the contents of the dataTable.  I feel like I'm missing something like 'gridView.DataBind();' but I can't find anything like that in the documentation.  Code is below:

public static void ExportToExcel(DataTable myDT)

        {             using (Telerik.WinControls.UI.RadGridView grid = new Telerik.WinControls.UI.RadGridView())

            {

                grid.AutoGenerateColumns = true;

                grid.DataSource = myDT;

                //grid.LoadElementTree();

                //grid.Refresh();

                GridViewSpreadExport spreadExporter = new GridViewSpreadExport(grid);                 SpreadExportRenderer exportRenderer = new SpreadExportRenderer();

                spreadExporter.RunExport("c:\\exportedFile.xlsx", exportRenderer);

            }

        }

[Dess | Tech Support Engineer, Principal]

Hello Greg,

Thank you for writing.  

The provided code snippet is greatly appreciated. Note that it is important to initialize the RadGridView.BindingContext before setting the DataSource property:

public Form1()
{
    InitializeComponent();
    DataTable dt = new DataTable();
    dt.Columns.Add("Id");
    dt.Columns.Add("Name");
    for (int i = 0; i < 10; i++)
    {
        dt.Rows.Add(i, "Item" + i);
    }
    using (Telerik.WinControls.UI.RadGridView grid = new Telerik.WinControls.UI.RadGridView())
    {
        grid.AutoGenerateColumns = true;
        grid.BindingContext = new System.Windows.Forms.BindingContext();
        grid.DataSource = dt;
        GridViewSpreadExport spreadExporter = new GridViewSpreadExport(grid);
        SpreadExportRenderer exportRenderer = new SpreadExportRenderer();
        string fileName = @"..\..\exported" + DateTime.Now.ToLongTimeString().Replace(":", "_") + ".xlsx";
        spreadExporter.RunExport(fileName, exportRenderer);
        Process.Start(fileName);
    }
}

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Telerik by Progress

[Kalai]

hai dess,

In binding datasource to a radgrid on first time it will show two time it will bind Why?

[Nadya]

Hello, Kalai,

The provided brief information is not enough to replicate the problem that you have. By default, when you set the DataSource property of RadGridView it automatically creates the columns according to the applied data source and fills the necessary data. You can generate columns for RadGridView in two ways:

- Automatically, according to the columns in the data source

- Manually, with columns added by the user

The two modes can be switched using the template's AutoGenerateColumns property. The default value of the property is true, indicating the columns will be generated from the data source. Take a look at the following example and the result demonstrated in the picture:

public RadForm1()
{
    InitializeComponent();

    DataTable dt = new DataTable();
    dt.Columns.Add("Id");
    dt.Columns.Add("Name");
    for (int i = 0; i < 30; i++)
    {
        dt.Rows.Add(i, "Name" + i);
    }
    this.radGridView1.DataSource = dt;
}

In case you need further assistance, could you please specify which is the exact setup that you have and provide more information about the problem that you have? What is shown two times on your side?

I hope this information helps. Let me know if you need further assistance.

Regards,
Nadya
Progress Telerik

[Kalai]

at Telerik.WinControls.RadItem.PaintBorderHighlight(IGraphics screenRadGraphics)
at Telerik.WinControls.RadItem.PaintVisualEffects(IGraphics screenRadGraphics)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
at Telerik.WinControls.RadControl.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.ScrollableControl.WndProc(Message& m)
at Telerik.WinControls.RadControl.WndProc(Message& m)
at Telerik.WinControls.UI.RadGridView.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)

[Kalai]

Big Red Cross Mark in Grid in Telerik radgrid

[Dess | Tech Support Engineer, Principal]

Hello, Kalai,

Your question has already been answered in the other thread (Ticket ID: 1521749) you have opened on the same topic. You can find the ticket in Your Telerik Account. Please, see our answer there for more information.
We kindly ask you to use just one thread for a specific problem to contact us. Posting the same questions numerous times slows down our response time because we will need to review and address two or more tickets instead of one. Moreover, threads are handled according to license and time of posting, so if it is an urgent problem, we suggest you use a support ticket, which would be handled before a forum thread.

Thank you for your understanding.