Questions on UI for WinForms Forum

1 answer

302 views

Hi!,

Have a very simple example, binding custom collection to grid. And have a button, in event handler of it "bindingsource.AddNew();". Problem is when you sort grid, then try to add new row, I got "Object reference not set to an instance of an object." exception.

Here is the code, it is very simple:

    
            public partial class Form1 : Form  
        
                {  
        
                    public Form1()  
        
                    {  
        
                        InitializeComponent();  
        
                    }  
        
                    private void Form1_Load(object sender, EventArgs e)  
        
                    {  
        
                        InitEmployeeGrid();  
        
                        InitActions();  
        
                        BindData();  
        
                    }  
        
                    private void InitEmployeeGrid()  
        
                    {  
        
                        gridView.MasterGridViewTemplate.AllowAddNewRow = false;  
        
                        gridView.MasterGridViewTemplate.AutoGenerateColumns = false;  
        
                        GridViewTextBoxColumn nameColumn = new GridViewTextBoxColumn();  
        
                        nameColumn.FieldName = "Name";  
        
                        nameColumn.HeaderText = "Name";  
        
                        nameColumn.UniqueName = "nameColumn";  
        
                        gridView.Columns.Add(nameColumn);  
        
                    }  
        
                    public void InitActions()  
        
                    {  
        
                        addToolbarButton.Click += new EventHandler(addToolbarButton_Click);  
        
                        cancelToolbarButton.Click += new EventHandler(cancelToolbarButton_Click);  
        
                    }  
        
                    void cancelToolbarButton_Click(object sender, EventArgs e)  
        
                    {  
        
                        if (gridView.DataSource != null)  
        
                        {  
        
                            (gridView.DataSource as BindingSource).CancelEdit();  
        
                            gridView.CancelEdit();  
        
                        }  
        
                    }  
        
                    void addToolbarButton_Click(object sender, EventArgs e)  
        
                    {  
        
                        if (gridView.DataSource != null)  
        
                        {  
        
                            (gridView.DataSource as BindingSource).AddNew();  
        
                            gridView.BeginEdit();  
        
                        }  
        
                    }  
        
                    private void BindData()  
        
                    {  
        
                        employeeBindingSource.DataSource = CreateDataSource();  
        
                        gridView.DataSource = employeeBindingSource;  
        
                    }  
        
                    private object CreateDataSource()  
        
                    {  
        
                        List<Employee> result = new List<Employee>();  
        
                        result.Add(new Employee("Georg"));  
        
                        result.Add(new Employee("Mike"));  
        
                        result.Add(new Employee("Timothy"));  
        
                        return result;  
        
                    }  
        
                }

Can anybody help me with this ? Thanks.

GridView

answered on 07 Nov 2008

1 answer

115 views

Problem on plotting with large values

Values on the x and y axis scale if become very large they tend to overlap. How to avoid this?

Chart (obsolete as of Q1 2013)

answered on 06 Nov 2008

1 answer

123 views

Zooming the Chart (Winforms)

We need to implement progressive zoom functionality for our Rad charts. Is this supported OR what is the best method to implement it. (The chart type is line chart)

How do i go about it ?

Chart (obsolete as of Q1 2013)

answered on 06 Nov 2008

4 answers

129 views

PanelBar covering part of form

Hi,
I have a mdi form which opens a child form. The problem I have is that the panelbar on the main form covers part of the child form when maximised. I wish I could attach a screenshot to show you.

Thanks for any help,

Derek.

Form

answered on 06 Nov 2008

3 answers

361 views

How to add telerik components through C# code?

I want to add a telerik component in my page on pageload event....I tried to use page.Controls.Add(telerikComponent);
But this function needs ASP components to pass as a parameter in, not the telerik components.....what to do for it plz help me!

General Discussions

answered on 06 Nov 2008

3 answers

229 views

[Solved] Getting xml from GridView datasource

Hi there,

I'm trying to generate xml from the datasource of rad gridview. Following is how I'm binding data to the grid:

radgvParticulars.MasterGridViewTemplate.DataSource = dsTODetails.Tables[1];

I'm wrote the following code to extract the xml from the datasource:

DataSet ds = (DataSet)radgvParticulars.DataSource;
string strXml = ds.GetXml();

This throws an InvalidCastException - "Unable to cast DataTable object to DataSet object". Then I tried the same by writing the below code:

DataTable dt = new DataTable();
dt = (DataTable)radgvParticulars.DataSource;
DataSet dsnew = new DataSet();
dsnew.Tables.Add(dt);
string strXml = dsnew.GetXml();

But this throws another exception: "DataTable already belongs to another DataSet".

I'm unable to proceed further. Pls help.

Regards,
Pramod Goutham.

GridView

answered on 05 Nov 2008

6 answers

299 views

[Solved] RadChildFrom Minimum Size

Hello i am using several RadForms as child forms for an mdi. Part of this is letting the user decide the size of each RadForm by entering values in textboxes(height and width textboxes). I have tried to put the resizing of forms in the text changed events, but that does not seem to be working, as the radform seems to default to a different size before the user has a chance to enter the full value. Why is this? I have tried setting the minimum size of these radforms to be really small as well, but it still seems to default to some other values. On a seperate note, i had this functionality with the resizing in the Leave event of the textbox. However the problem with that is if the user has entered values for a child form, and clicks on a different child form, it resizes the new child form instead. All these child forms are being created at run time and i am using Winforms Q2 SP1 2008. A work around for either one of those cases would be good. Thanks in advance.

Form

answered on 05 Nov 2008

3 answers

173 views

Header size in gridview

Is there a way, theming or otherwise, to change the height of the column header row in the gridview? I can't seem to find a property that does the trick.

Thanks!

Themes and Visual Style Builder

answered on 04 Nov 2008

1 answer

159 views

[Solved] Some properties I need

Hi experts!

I use this properties in the winform datagridview:

AllowUserToAddRows
AllowUserToDeleteRows
ColumnHeadersHeightSizeMode
Columns.AddRange
RowHeadersVisible

I can't find nothing like that in the Rad control.

Please help me ...

GridView

answered on 04 Nov 2008

1 answer

128 views

Alt. Rad Control question

I am using the carousel control in my app because of the gradient background and itemreflection properties.

Do you have any other controls, such as a panel control, that will allow me to add labels and have it reflect on the parent control? I also need to be able to add a gradient as well.

tx.

Carousel

answered on 04 Nov 2008

	public partial class Form1 : Form
	{
	public Form1()
	{
	InitializeComponent();
	}

	private void Form1_Load(object sender, EventArgs e)
	{
	InitEmployeeGrid();
	InitActions();
	BindData();
	}

	private void InitEmployeeGrid()
	{
	gridView.MasterGridViewTemplate.AllowAddNewRow = false;
	gridView.MasterGridViewTemplate.AutoGenerateColumns = false;

	GridViewTextBoxColumn nameColumn = new GridViewTextBoxColumn();
	nameColumn.FieldName = "Name";
	nameColumn.HeaderText = "Name";
	nameColumn.UniqueName = "nameColumn";

	gridView.Columns.Add(nameColumn);
	}

	public void InitActions()
	{
	addToolbarButton.Click += new EventHandler(addToolbarButton_Click);
	cancelToolbarButton.Click += new EventHandler(cancelToolbarButton_Click);
	}

	void cancelToolbarButton_Click(object sender, EventArgs e)
	{
	if (gridView.DataSource != null)
	{
	(gridView.DataSource as BindingSource).CancelEdit();
	gridView.CancelEdit();
	}
	}

	void addToolbarButton_Click(object sender, EventArgs e)
	{
	if (gridView.DataSource != null)
	{
	(gridView.DataSource as BindingSource).AddNew();
	gridView.BeginEdit();
	}
	}

	private void BindData()
	{
	employeeBindingSource.DataSource = CreateDataSource();
	gridView.DataSource = employeeBindingSource;
	}

	private object CreateDataSource()
	{
	List<Employee> result = new List<Employee>();

	result.Add(new Employee("Georg"));
	result.Add(new Employee("Mike"));
	result.Add(new Employee("Timothy"));

	return result;
	}
	}