CODEWITHSUNDEEP
c#mysqlsqlasp.net
Ash
Ash

Reputation: 73

How do you populate dynamic dropdowns based on a number field in database?

I'm trying to implement a drop down that will have numbers 1 - value in database.

I can get as far as displaying the value from the database in the dropdown, but can't get the numbers from 1 onwards to be created as options in the dropdown.

Below is my asp code:

    <asp:SqlDataSource
    ID="selectSprintLength"
    runat="server"
    ConnectionString="<%$ ConnectionStrings:scConnection %>"
    SelectCommand="SELECT * FROM sc_sprints WHERE scSprintID = @sprint">
    <SelectParameters>
        <asp:QueryStringParameter QueryStringField="sprint" Name="sprint" Type="String" />
    </SelectParameters>
</asp:SqlDataSource>

<asp:DropDownList ID="sprintLengthDropDown"
    runat="server"
    OnSelectedIndexChanged="sprintDropDown_SelectedIndexChanged"
    DataSourceID="selectSprintLength"
    DataTextField="scSprintTotal"
    DataValueField="scSprintTotal"
    AutoPostBack="true"
    EnableViewState="true" />

And this is my c# code:

protected void sprintDropDown_SelectedIndexChanged(object sender, EventArgs e)
{
    int counter = 0;
    int x = Int32.Parse(sprintLengthDropDown.SelectedValue);
    do
    {
         counter++;
    }
    while (counter < x);
}

Can anyone please help so that values 1 - scSprintTotal are all options in the dropdown. For instance scSprintTotal is 7, the drop down values would be 1, 2, 3, 4, 5, 6, 7.

Thanks in advance!

Upvotes: 0

Views: 55

Answers (2)

Bp2018
Bp2018

Reputation: 1

 int items;
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlCommand cmd = new SqlCommand("SELECT * from scSprint",con);
        con.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            Label1.Text = "The total is " + dr["scsprinttotal"].ToString(); 
            items = Convert.ToInt32(dr["scsprinttotal"].ToString());
        }
        con.Close();
        for (int i = 1; i <= items;i++ )
        {
            DropDownList1.Items.Add(i.ToString());
        }

    }

Upvotes: 0

user4221591
user4221591

Reputation: 2180

To fill the dropdown with series value we can use Enumerable.Range(starting_number, range); Please see the tutorial https://www.dotnetperls.com/enumerable-range

sprintLengthDropDown.DataSource = Enumerable.Range(1, 7);
sprintLengthDropDown.DataBind();

You can make the range dynamic as the value from database.

Upvotes: 1

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