Bind default value to dropdown list from datatable c#

Question

Code

protected void Page_Load(object sender, EventArgs e)
{        
    ddlYear.DataSource = GetYear();
    ddlYear.DataBind();
    ddlYear.Items.Insert(0, "--Select--");
    ddlYear.Items.Insert(1, "All");
}

public static DataTable GetYear()
    {
        DataTable dt = new DataTable();
        string strcon = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        using (SqlConnection conn = new SqlConnection(strcon))
        {
            conn.Open();
            string strQuery = "SELECT Previous_Year AS Year FROM Year UNION ALL SELECT Current_Year FROM Year";
            SqlCommand cmd = new SqlCommand(strQuery, conn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);
        }
        return dt;
    }

My datatable returns the below value

2014
2015

Now on page load my dropdown values should be like the below and by default I need to show 2014 value in the dropdown list.

--Select--
   All
  2014
  2015 

Answer 1

Try this,

ddlYear.DataSource = GetYear();
ddlYear.DataBind();
ddlYear.Items.Insert(0, "--Select--");
ddlYear.Items.Insert(1, "All");
ddlYear.Items.FindByValue("2014").Selected = true;

Answer 2

First add your data from your database by using the DataSource and DataBind() function.

You can add a default option to your select by creating a new ListItem and insert it at the beginning of your items.

ListItem item = new ListItem();
item.Text = "All";
item.Value = "-1";

this.ddlSelectBoxId.Items.Insert(0, item);

To select 2014:

this.ddlSelectBoxId.SelectedValue = "2014";

Here ddlSelectBoxId is the Id of your ASP Dropdownlist control.

To display the current year, you can use the following:

this.ddlSelectBoxId.SelectedValue = DateTime.Now.Year.ToString();

To display the first item from your DataTable :

Make sure you have sorted using the SQL command to your needs, after that use:

this.ddlSelectBoxId.SelectedValue = DataTable.Rows[0][0];

This takes the first row and the first column of your first row. DataTable is your variable returned by your function.

Answer 3

If the sequence is directly 2014,2015..... then you can set the appenddatabounditems property of drop down list to true.

Also, On page load

ddlYear.DataSource = GetYear();
Dim L As New List(Of string)
For Each item As ListItem In ddlYear
L.Add((item.Value).ToString());
Next
ddlYear.selectedvalue = L.Min();
ddlYear.DataBind();

Answer 4

I Hope you want to select the current year as selected by default. You can do that by

ddlYear.SelectedValue=DateTime.Today.Year.ToString()