How Do I Get the Selected Value from an ASP.NET DropdownList with a Datasource?

Getting Selected Value from DropdownList with Datasource

When using a DropdownList with a datasource in ASP.NET, it's essential to understand how to retrieve the user's selection.

To establish the datasource for a DropdownList, consider three key factors:

• DataSource: Specifies the dataset, datatable, or custom datasource.
• DataValueField: Defines the hidden field.
• DataTextField: Represents the values displayed in the dropdown.

For instance, to bind a DropdownList to a DataTable stored in "dt":

DropDownList1.DataTextField = "QUIZ_Name";
DropDownList1.DataValueField = "QUIZ_ID";
DropDownList1.DataSource = dt;
DropDownList1.DataBind();

To handle the user's selection, set AutoPostBack="true" and use the SelectedIndexChanged event:

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    string strQUIZ_ID = DropDownList1.SelectedValue;
    string strQUIZ_Name = DropDownList1.SelectedItem.Text;
    // Your code based on user selection...
}

By following these steps, you can efficiently populate your DropdownList from a datasource and respond to the selected value.

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