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How do we clear previous page data on SelectedIndexChanged Event..? [closed]

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I have aspx page.having an issue is that if we select first time option from drop down value gets appears on the page.but when we select second time option from drop down still previous data getting appears. how do i clear all the previous data after drop-down SelectedIndexChanged Event..?

As you have not provided the code when i'm writing this answer. In Asp.net u can achieve this by using jquery. I'm using club dropdown list with ID clubs as an example. This event will bind to the list and will keep on updating selected variable when the selectedIndex change. Then you can simply pass the selected variable value to lets say a span element with id spanClub
$(document).ready(() => {
$('#Clubs').change(() => {
let selected = $('#Clubs :selected').text();
$('#spanClub').text(selected);
});
});

How to get field value in page_load event in ASP.Net? [closed]

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I have created the text box using JavaScript in document.ready function and append with existing custom control using its class name in ASP.Net.
How can I get the text box value in page_load event?

So the control you have created is not a control in ASP.NET sense of things. Strictly speaking, this is just an page element, ASP.NET does not know anything about it.
However if this was a textbox, it apparently became a part of a form, so there is a good chance you can access it's value from the Request object:
string textBoxValue = Request.Form.GetValues("textBoxName");
Note 1. To have this value in the request, you need to make sure the textbox has name attribute set up: name='textBoxName'
Note 2. This is definitely not a common or encouraged practice in ASP.NET world. Have you considered manipulating visibility of a server-side textbox?

modify design of create form and partial view of last records with same ID [closed]

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I have a question about the design of the form that is automatically generated. Can I modify the CSS behind and where ? the problem is maybe easy but I am beginner so be comprehensive :)
Also what I want to do, is when the user fill the form and send it, that he will be able to see the last records that have the same first property of my model (ClientID) when filling the next records.
I know there is the partial view but how can I implement it ?
Thank you for your help!
Best regards,

have a question about the design of the form that is automatically
generated. Can I modify the CSS behind and where ? the problem is
maybe easy but I am beginner so be comprehensive :)
You Modifiy the CSS just like a normal website. By default this is in your Content folder labeled 'Site.css'
The second part of the question is too broad to answer well. Please update the question with methods you have tried and some code.
Partial views enables you to define a view that will be rendered inside a parent view. After the site is rendered they become one HTML. Just a way for you to separate and reuse your view.
The pseudo idea would you to
Retrieve records var matchingRecords = Records.Where(x => x.ClientID == ClientID)
Store records to a viewModel var viewModel = new yourViewModel{Records = matchingRecords}
Pass your viewModel to your view
Have your partial view also inherit that viewModel (or interface of viewModel with records) and have it loop over said records and do what you need
Again this is very broad because your question is broad. In general it is best to supply code with your question and be specific. Also show what you have tried.

Is it possible to display a table/a Dictionary collection in the ToolTip of an image? [closed]

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I have a requirement to show a list of details in a ToolTip. Is this possible to do? I tried setting a Dictionary to a Tooltip in the code behind. It just displayed Collection.?? Kindly help

You can display anything you choose in a tooltip (WPF is nice like that - you can template anything). However, when you set a Dictionary to the tooltip value, it doesn't know what you want to do with it and defaults to a useless string of text.
Try setting a template for your tooltip that would render the dictionary in a useful way. Since ToolTip is a ContentControl, it will work this out for itself if there's a suitable template available (either keyed by type, or set within the ToolTip).

Add 10 months automatically to textbox2 based on user selected date in textbox1 [closed]

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I have 2 textboxes.
In 1st text box user select the date by using calender control in asp.net.
After adding the required date in textbox1, i wont to add the 10 months and display the date in textbox2 automatically.
And which event i can use to add the date in textbox2 immediately after selecting the date in textbox1
Ex: textbox1:19/12/2013 then after selecting this date, then textbox2 automatically fill with like textbox2:19/10/2014
Please Help Me

try this
DateTime add_Months = Convert.ToDateTime(textbox1.Text).AddMonths(10);
textbox2.Text = add_Months.ToString();

simply use html5
<input type="date">
make it simple
For more info
http://www.w3.org/TR/html5-author/common-microsyntaxes.html#dates-and-times