What has a SelectedValue that is invalid because it does?

Posted on by Mary Andersen

What has a SelectedValue that is invalid because it does?

‘DropDownList’ has a SelectedValue which is invalid because it does not exist in the list of items. As it is possible for the user to change the values of the list (in a codetable) it is possible that an earlier selected item not exists anymore.

How do I bind a dropdown in a text box?

Other way you can do is just drag and drop SQL datasource to on page . and give the connection and command to Datasource . and in Aspx code specify the DatasourceID property of Dropdown to SQLDatasource which is above datasource.

How do you bind data into a DropDownList?

Now bind the DropDownList with the database table.

  1. SqlConnection con = new SqlConnection(str);
  2. string com = “Select * from UserDetail”;
  3. SqlDataAdapter adpt = new SqlDataAdapter(com, con);
  4. DataTable dt = new DataTable();
  5. adpt. Fill(dt);
  6. DropDownList1. DataSource = dt;
  7. DropDownList1. DataBind();
  8. DropDownList1.

How do I make a DropDownList not selectable?

Enabled = false; This will disable the item from the list by basically not showing it in the list. “ReportValue” = the value of the item to be disabled.

What is AppendDataBoundItems in Dropdownlist in asp net?

The AppendDataBoundItems property allows you to add items to the ListControl object before data binding occurs. After data binding, the items collection contains both the items from the data source and the previously added items. The value of this property is stored in view state.

How do you populate a textbox by dropdown selection in MVC?

3 Answers

  1. (1) @Html.DropDownList(“ProductName”, new SelectList(ViewBag.ProductData, “Name”, “Name”), new { @id = “ProductName” })
  2. (2) @Html.EditorFor(model => model.ProductId, new { htmlAttributes = new { @id=”ProductId”, @class = “form-control” } })

How do you bind a dropdown in the grid?

Use DropDownlist In GridView In ASP.NET Using C#

  1. Initial chamber.
  2. Step 1: Open Visual Studio 2010 and create an empty Website.
  3. Step 2: In Solution Explorer you will get your empty website, Add a web form, SQL Database.
  4. For Web Form:
  5. For SQL Server Database:
  6. Database chamber.

What is selected value in DropDownList?

Cause SelectedValue will give you the value stored for current selected item in your dropdown and SelectedItem. Value will be Value of the currently selected item.

How do you make a dropdown not editable in HTML?

According to HTML specs, the select tag in HTML doesn’t have a readonly attribute, only a disabled attribute. So if you want to keep the user from changing the dropdown, you have to use disabled .

What is AppendDataBoundItems true?

AppendDataBoundItems=”true” The AppendDataBoundItems property allows you to add items to the ListControl object before data binding occurs. After data binding, the items collection contains both the items from the data source and the previously added items. The value of this property is stored in view state.

What is DropDownList asp net?

The DropDownList is a web server control which is used to create an HTML Select component. It allows us to select an option from the dropdown list. It can contain any number of items. ASP.NET provides a tag to create DropDownList for web application.

How can I add dropdown selected value in database in ASP NET MVC?

Simply Create Dropdown List From Database In MVC 5.0

  1. Firstly, we are creating a table in our database.
  2. After that, select the ADO.NET Entity Data Model and click on “Add” button.
  3. Here, check the college table and in View, we have checked our View with the name schoolname.
  4. And now, add new View.

Where is dropdown control in GridView?

To start with, add the GridView control to your page, add the bound columns if any, then add two template columns: one for the DropDownList and one for the TextBox . Set the AutoPostBack property to ” True ” for the DropDownList , and create the SelectedIndexChanged event. Let’s move on to the code-behind.

How do I bind a dropdown in .NET core?

Binding Dropdown List With Database in ASP.NET Core

  1. Step -1. Open Visual Studio Code.
  2. Step -2. Click on the file in the menu and select Open Folder.
  3. Step -3. Go to Terminal and Select New Terminal in the menu.
  4. Step -4. Build and Run the MVC Application.
  5. Output. Download.

What is SelectedValue C#?

The SelectedValue property is commonly used to determine the value of the selected item in the list control. If multiple items are selected, the value of the selected item with the lowest index is returned. If no item is selected, an empty string (“”) is returned.

How to set selected value in dropdown list?

The dropdownlist has 2 properties. A DataTextField and a DataValueField. Is your DataValue field properly … double click on your dropdownlist and change the end text of the sub from .selectedindexchanged to .databound then write your code that sets the selected value to the cell value from the database.

How to fix drop down list not working?

Indeed, the delimited list in the Drop Down list is case-sensitive. So, the way to fix the problem is to enter the exact value with upper and lower case from the Drop Down list. 5. If Invalid Entries are Allowed and Drop Down List Not Working

When dropdown list is loaded with some values it should show?

I want, whenever the dropdownlist is loaded with some values. first it should show the default value. and after some value is selected then the value should be their. currently the value is not getting selected. Thanks for contributing an answer to Stack Overflow!

When drop down list is not visible in Excel?

When Drop Down List is not Visible 1.1. If Objects are Hidden 1.2. Checking the Drop Down Option 1.3. Highlighting The Cell 1.4. If Workbook is Corrupted 2. Showing Blank in Drop Down List