How to restrict user to select month year in ascending order

Question

User82362805 posted

In Asp.net webform (C#) application I have a form which contains 2 dropdowns for month and year I need to restrict the user to select month and year in ascending order For example, if user select month and year 03/2018 he must be selected previous month in the same year. I already save monthandyear field in database which user select from dropdowns. 

Kindly help me.

Answer 1

User409696431 posted

Can you clarify the requirement?  Are you saying if a user has previously selected a month/year that they must select the next month?  If so, why offer that user a dropdown?

Answer 2

User288213138 posted

Hi AfaqRajput,

According to your description, I wrote a demo for you as a reference.

I traverse the value in the DropdownList to compare it with the currently selected value.

If it is larger than the currently selected month, set his property to disabled.

The code:

 <div>
            <asp:DropDownList ID="DropDownList1" runat="server">
                <asp:ListItem>1</asp:ListItem>
                <asp:ListItem>2</asp:ListItem>
                <asp:ListItem>3</asp:ListItem>
                <asp:ListItem>4</asp:ListItem>
                <asp:ListItem>5</asp:ListItem>
                <asp:ListItem>6</asp:ListItem>
                <asp:ListItem>7</asp:ListItem>
                <asp:ListItem>8</asp:ListItem>
                <asp:ListItem>9</asp:ListItem>
                <asp:ListItem>10</asp:ListItem>
                <asp:ListItem>11</asp:ListItem>
                <asp:ListItem>12</asp:ListItem>
            </asp:DropDownList>
            <asp:DropDownList ID="DropDownList2" runat="server">
                <asp:ListItem>2010</asp:ListItem>
                <asp:ListItem>2011</asp:ListItem>
                <asp:ListItem>2012</asp:ListItem>
                <asp:ListItem>2013</asp:ListItem>
                <asp:ListItem>2014</asp:ListItem>
                <asp:ListItem>2015</asp:ListItem>
                <asp:ListItem>2016</asp:ListItem>
                <asp:ListItem>2017</asp:ListItem>
                <asp:ListItem>2018</asp:ListItem>
                <asp:ListItem>2019</asp:ListItem>
            </asp:DropDownList>
            <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
        </div>

Aspx.cs:
 protected void Button1_Click(object sender, EventArgs e)
        {
            foreach (ListItem item in DropDownList1.Items)
            {
                if (Convert.ToInt32(DropDownList1.SelectedValue)<Convert.ToInt32(item.Value))
                {
                    item.Attributes.Add("disabled", "disabled");
                }
            }
            foreach (ListItem item in DropDownList2.Items)
            {
                if (Convert.ToInt32(DropDownList2.SelectedValue) != Convert.ToInt32(item.Value))
                {
                    item.Attributes.Add("disabled", "disabled");
                }
            }
        }

The result:

Best regards,

Sam