Error when i compile

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I get an error when I run it, it says Input string was not in a correct format. can someone please assist, I have tried everything

C#

public partial class Test : System.Web.UI.Page
    {
        private void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                ddlMonth.DataSource = Enumerable.Range(1, 12).Select(a => new
                {
                    MonthName = DateTimeFormatInfo.CurrentInfo.GetMonthName(a),
                    MonthNumber = a
                }
                );
                ddlMonth.DataBind();
                ddlYear.DataSource = Enumerable.Range(DateTime.Now.Year - 99, 100).Reverse();
                ddlYear.DataBind();
                ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedValue)));
                ddlday.DataBind();
            }
        }

        protected void ddlMonth_SelectedIndexChanged(object sender, EventArgs e)
        { ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedValue))); ddlday.DataBind(); }

        public bool IsPostBack { get; set; }
    }
}

Posted 17-Aug-12 0:35am

MarkNinja

Updated 17-Aug-12 0:38am

Malli_S

v2

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Comments

Malli_S 17-Aug-12 6:39am

Please do post what compile error you get.

3 solutions

Solution 1

I think in Convert.ToInt32(ddlMonth.SelectedValue); ...
'ddlMonth.SelectedValue' is not a valid integer string.

//Check it first//
MessageBox.show(ddlMonth.SelectedValue.toString());
it will show integer string.
Make sure this is a valid integer string.

Posted 17-Aug-12 0:55am

Rock (Multithreaded)

Solution 2

Try this

C#

private void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                ddlMonth.DataSource = Enumerable.Range(1, 12).Select(a => new
                {
                    MonthName = DateTimeFormatInfo.CurrentInfo.GetMonthName(a),
                    MonthNumber = a
            //DataTextField = DateTimeFormatInfo.CurrentInfo.GetMonthName(a),
            //DataValueField = a
              }
                );

        //If this code is not working then try the above code in the loop.
        ddlMonth.DataTextField="MonthName";
        ddlMonth.DataValueField="MonthNumber";

                ddlMonth.DataBind();
                ddlYear.DataSource = Enumerable.Range(DateTime.Now.Year - 99, 100).Reverse();
                ddlYear.DataBind();
                ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedValue)));
                ddlday.DataBind();
            }
        }

Posted 17-Aug-12 1:04am

Prabhakaran Soundarapandian

Comments

MarkNinja 17-Aug-12 7:19am

Why is it not validating the how many days there are in a month?

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Afrozshaikh · Accepted Answer · 2012-08-17T01:28:00

Solution 3

Replace

ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedValue)));

with

ddlday.DataSource = Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, Convert.ToInt32(ddlMonth.SelectedIndex + 1)));

I think this will solve your issue.

Posted 17-Aug-12 1:28am

Afrozshaikh

Comments

MarkNinja 17-Aug-12 7:44am

I see it is not evening stepping into the code

MarkNinja 17-Aug-12 8:28am

I came right thanks i enabled postback on the dropdown list and set the ddlmonth event to point to the that event