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display combobox in datagridview

I am new to programming...
I want to display combobox in a particular column as soon as user starts to enter the text in that column or a cell got selected in that column and it shows the combobox along with its list ,also let to user to type their own values in that cell and display that value as cell text . Currently available comboboxcell doesn't have such faculties . how can i accomplish such task .
any reference to to this ..
thanks in advance ...

Get hidden text of table rows using selenium webdriver?

My dropdown box is of type "Input" and its values are listed using table.I'm able to get the rows using following code.
WebElement table = driver.findElement(By.id("testTable"));
List<WebElement>tr_collection=table.findElements(By.xpath("id('testTable')/tbody/tr"));
Row text is retrieved only when the dropdown is clicked and text is displayed.Is it possible to get the text when it is hidden ?

The method WebElement.GetText() returns the text visible to a user. To get the hidden text, you can read the HTMLElement.textContent property. Though, I would recommend it in a testing context since it doesn't reflect a real usage.
To get the text with .GetAttribute:
string text = element.GetAttribute("textContent");
To get the text with .ExecuteScript:
string text = (string)driver.ExecuteScript("return arguments[0].textContent;", element);

Compare display value with binding source value in DataGridView.CellFormatting?

I am now using a plain DataGridView component to display data with my own implementation of IBindingSource interface. The columns are binded to properties.
Now I am trying to compare the current "display value" in the grid (i.e. the actual previous value) and the latest value in the IBindingSource to determine background of the cell. Is it correct to compare the Value on the event with the value like Grid.Rows[rowIndex].Cells[columnIndex] ? Or is there any other way to do this?
Thanks in advance.

WPF 4.0 Combo box Display Message When binding data is null

I have Two Combo boxes named category and sub-category. I want to display specific data in sub-category combo box based on category combo box selection. But sometimes when I select some category, it doesn't have any value to show in sub-category. At that time I need to display an error message like No Records Found.
Is there some method to do so?

There is a Binding.TargetNullValue property. The value of this property is used as target value when the binding source value is null.

Save Value and text in Combobox

hi i have a combobox in c# winform.
i have to save two things against each elemet. a Text which will be displayed to user and a id against that text.
in Asp.Net we can save these values in Text and Value fields of listbox..
but how to handle this situation in winform app

You can use a BindingSource to store data. And then bind it to your ComboBox. Remember to set ComboBox.ValueMember (points to ID field) and ComboBox.DisplayMember (points to Text field) properties.

comboBox1.SelectedValue;
comboBox1.SelectedText;
These two will work for you.
Happy coding.