Auto-Populate Year and Month in dropdown list in ASP.NET or SharePoint Visual Webpart

This tutorial we will discuss, how to auto-populate Year and Month in a dropdown list using c# code in asp.net or in SharePoint visual web part.

Auto Populate Year and Month in dropdown list in SharePoint

Here I have created four dropdown list which is From Year, From Month To Year and To Month using C#.Net code.

Follow the below source code.

 <div class='FilterRow' runat="server" id="divDateRange">
                            <div class="FormLabel">
                                <label>
                                    <%=GetLocalResourceObject("SelectDateRangeFrom")%></label>
                            </div>
                            <div class="FormControls">
                                <asp:DropDownList runat="server" CssClass="Drop" Style="width: 100px !important;height: 35px !important;" ID="ddlYearFrom" CausesValidation="false" AutoPostBack="true" OnSelectedIndexChanged="ddlYearFrom_SelectedIndexChanged"></asp:DropDownList>
                                <asp:DropDownList runat="server" CssClass="Drop" Style="width: 100px !important;height: 35px !important;" ID="ddlMonthFrom"></asp:DropDownList>
                            </div>
                            <div class="FormLabel">
                                <label>
                                    <%=GetLocalResourceObject("SelectDateRangeTo")%></label>
                            </div>
                            <div class="FormControls">
                                <asp:DropDownList runat="server" CssClass="Drop" Style="width: 100px !important;height: 35px !important;" ID="ddlYearTo" AutoPostBack="true" OnSelectedIndexChanged="ddlYearTo_SelectedIndexChanged"></asp:DropDownList>
                                <asp:DropDownList runat="server" CssClass="Drop" Style="width: 100px !important;height: 35px !important;" ID="ddlMonthTo"></asp:DropDownList>
                            </div>
                        </div>

Example 1: Getting current Year

Below code we can use to get the current year in the dropdown list.

if (ddlYearFrom.DataSource == null && ddlYearTo.DataSource==null)
            {
                List<int> years = new List<int>();
                for (int i = DateTime.Now.Year; i >= minYear; i--)
                {
                    years.Add(i);
                }
                ddlYearFrom.DataSource = ddlYearTo.DataSource = years;
                ddlYearFrom.DataBind();
                ddlYearTo.DataBind();

                Dictionary<int, string> Frommonth = new Dictionary<int, string>();
                Dictionary<int, string> Tomonth = new Dictionary<int, string>();
                string language = "en-US";
                if (System.Threading.Thread.CurrentThread.CurrentUICulture.LCID == 1025)
                    language = "ar-QA";
                DateTimeFormatInfo datatimeFormat = new CultureInfo(language).DateTimeFormat;
                int minMonth = 1;
                for (int j = DateTime.Now.Month; j >= minMonth; j--)
                {
                    Tomonth.Add(j, datatimeFormat.GetMonthName(j));
                    ddlMonthTo.DataSource = ddlMonthFrom.DataSource = Tomonth;
                    ddlMonthTo.DataTextField = ddlMonthFrom.DataTextField = "Value";
                    ddlMonthTo.DataValueField = ddlMonthFrom.DataValueField = "Key";
                    ddlMonthTo.DataBind();
                    ddlMonthFrom.DataBind();
                }
                int currentYear = DateTime.Now.Year;               ddlYearFrom.Items.FindByValue(currentYear.ToString()).Selected = ddlYearTo.Items.FindByValue(currentYear.ToString()).Selected = true;
            }

Example 2: Getting current Month

Below code is to populate the current month in the dropdown list.

int currentMonth = DateTime.Now.Month;
ddlMonthFrom.Items.FindByValue(currentMonth.ToString()).Selected = ddlMonthTo.Items.FindByValue(currentMonth.ToString()).Selected = true;

Example 3: Getting all Months

Below is the code to get the months from the drowndown list.

 for (int i = 1; i <= 12; i++)
                {
                    ddlMonthFrom.DataSource = null;
                    StartFrommonth.Add(i, datatimeFormat.GetMonthName(i));
                    ddlMonthFrom.DataSource = StartFrommonth;
                    ddlMonthFrom.DataTextField = "Value";
                    ddlMonthFrom.DataValueField = "Key";
                    ddlMonthFrom.DataBind();
                }

Example 4: Validate Year and Month

To validate Year and Month we can use the below code in the dropdown list.

 if (Convert.ToInt32(ddlYearFrom.SelectedValue) > Convert.ToInt32(ddlYearTo.SelectedValue))
                                {
                                    lblResult.Text = GetLocalResourceObject("invalidDate").ToString();
                                    lblResult.Visible = true;
                                    return;
                                }
                                else if (Convert.ToInt32(ddlYearFrom.SelectedValue) == Convert.ToInt32(ddlYearTo.SelectedValue))
                                {
                                    if (Convert.ToInt32(ddlMonthFrom.SelectedValue) > Convert.ToInt32(ddlYearTo.SelectedValue))
                                    {
                                        lblResult.Text = GetLocalResourceObject("invalidDate").ToString();
                                        lblResult.Visible = true;
                                        return;
                                    }

                                }

Example 5: Skip the months if Year is 2018

if (ddlYearFrom.SelectedValue == "2018")
            {
                for (int i = 5; i <= 12; i++)
                {
                    ddlMonthFrom.DataSource = null;
                    StartPremonth.Add(i, datatimeFormat.GetMonthName(i));
                    ddlMonthFrom.DataSource = StartPremonth;
                    ddlMonthFrom.DataTextField = "Value";
                    ddlMonthFrom.DataValueField = "Key";
                    ddlMonthFrom.DataBind();
                }
            }

Example 6: Getting Month in both Arabic and English

Below code we can use to get month in different languages in dropdown list.

string language = "en-US";
                if (System.Threading.Thread.CurrentThread.CurrentUICulture.LCID == 1025)
                    language = "ar-QA";
                DateTimeFormatInfo datatimeFormat = new CultureInfo(language).DateTimeFormat;

Example 7: Getting current Month and past month in current Year

Below is the code to get the current and past month in current year in SharePoint visual web part.

 if (Convert.ToInt32(ddlYearFrom.SelectedValue) == DateTime.Now.Year)
            {
                for (int j = DateTime.Now.Month; j >= minMonth; j--)
                {
                    ddlMonthFrom.DataSource = null;
                    StartTomonth.Add(j, datatimeFormat.GetMonthName(j));
                    ddlMonthFrom.DataSource = StartTomonth;
                    ddlMonthFrom.DataTextField = "Value";
                    ddlMonthFrom.DataValueField = "Key";
                    ddlMonthFrom.DataBind();
                }
            }

The above code we can use to create a custom calendar control using C# code.

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Here we learned how to auto populate Year and Month in a dropdown list using c# code in asp.net or in SharePoint visual web part.