获取网格行命令事件上的下拉列表选择项

Question

I have a manage Customer table and grid view customer .

I am trying to update grid record. I want when i click edit link records display in table.

I am trying to do it on Grid_Row_command event .

I am getting records on textbox but not able to get selected dropdown record.

Please tell me how to do this.

Here is snapshot of my table & Gridview.

.

Here is my code-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Mspl.Web.MobileTracking.BL;
using Mspl.MobileTracking.Model;

namespace Mspl.Web.MobileTracking.UserControls
{
    public partial class ManageCustomers : System.Web.UI.UserControl
    {
        Utility utility;
        string result = string.Empty;
        User user = new User();
        CustomerBL customerBL;
        Customer Customer = new Customer();
        CustomerBL Customers = new CustomerBL();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindCountry();
                BindCustomer();
            }

            lblMessage.Text = string.Empty;
        }

        private void BindStates()
        {
            utility = new Utility();
            var states = utility.GetStates(ddlCountry.SelectedItem.Value);
            ddlState.DataSource = states;
            ddlState.DataTextField = "Name";
            ddlState.DataValueField = "ID";
            ddlState.DataBind();
            ddlState.Items.Insert(0, "--Select--");
        }

        private void BindCountry()
        {
            utility = new Utility();
            var countries = utility.GetCountries();
            ddlCountry.DataSource = countries.ToList<Country>();
            ddlCountry.DataTextField = "Name";
            ddlCountry.DataValueField = "ID";
            ddlCountry.DataBind();
            ddlCountry.Items.Insert(0, "--Select--");
        }

        private void BindDistricts()
        {
            utility = new Utility();
            var districts = utility.GetDistricts(ddlState.SelectedItem.Value);
            ddlDistrict.DataSource = districts;
            ddlDistrict.DataTextField = "Name";
            ddlDistrict.DataValueField = "ID";
            ddlDistrict.DataBind();
            ddlDistrict.Items.Insert(0, "--Select--");
        }

        private void BindCustomer()
        {
            gvCustomer.DataSource = Customers.GetAllCustomers();
            gvCustomer.DataBind(); 
        }


        protected void gvCustomer_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "displayCustomer")
            {
                GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
                hfCustomerId.Value = Convert.ToString(e.CommandArgument);
                Label lblCName = (Label)row.FindControl("lblCustomerName");
                txtCustomerName.Text = lblCName.Text;
                Label lblAdd1 = (Label)row.FindControl("lblAddressLine1");
                txtAddressline1.Text = lblAdd1.Text;
                Label lblAdd2 = (Label)row.FindControl("lblAddressLine2");
                txtAddressline2.Text = lblAdd2.Text;
                Label lblPhone = (Label)row.FindControl("lblPhone");
                txtPhone.Text = lblPhone.Text;
                Label lblMobile = (Label)row.FindControl("lblMobile");
                txtMobileNumber.Text = lblMobile.Text;
                Label lblCountry = (Label)row.FindControl("lblCountry");
                ddlCountry.SelectedIndex = Convert.ToInt32(lblCountry.Text);
                Label lblState = (Label)row.FindControl("lblState");
                ddlState.SelectedIndex = Convert.ToInt32(lblState.Text);
                Label lblDistrict = (Label)row.FindControl("lblDistrict");
                ddlDistrict.SelectedIndex = Convert.ToInt32(lblDistrict.Text);
                Label lblCity = (Label)row.FindControl("lblCity");
                txtCity.Text = lblCity.Text; 
            }
        }

        protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
        {
            BindStates();
        }

        protected void ddlState_SelectedIndexChanged(object sender, EventArgs e)
        {
            BindDistricts();
        }

        protected void btnUpdate_Click(object sender, EventArgs e)
        {
            Customer customers = new Customer();
            user = Session["UserDetails"] as User;
            customers.ID = hfCustomerId.Value;
            customers.Name = txtCustomerName.Text;
            customers.Mobile = txtMobileNumber.Text;
            customers.Phone = txtPhone.Text;
            customers.AddressLine1 = txtAddressline1.Text;
            customers.AddressLine2 = txtAddressline2.Text;
            customers.Country = ddlCountry.SelectedItem.Value;
            customers.State = ddlState.SelectedItem.Value;
            customers.District = ddlDistrict.SelectedItem.Value;
            customers.City = txtCity.Text;
            customers.UpdatedBy = user.ID;

            if (Page.IsValid)
            {
                var result = Customers.UpdateCustomer(customers);
                if (result == "Success")
                    lblMessage.Text = "Sucessfully Updated";
                else
                    lblMessage.Text = "Already Exists";

                BindCustomer();
                refreshControls();
            }

            setFormstatus(0);

        }
    }
}

My grid Code-

<asp:HiddenField ID="hfCustomerId" runat="server" />
                <asp:GridView ID="gvCustomer" runat="server" AutoGenerateColumns="False" CellPadding="4"
                    EnableModelValidation="True" ForeColor="#333333" GridLines="Both" 
                    onrowcommand="gvCustomer_RowCommand" onrowcreated="gvCustomer_RowCreated">
                    <AlternatingRowStyle BackColor="White" />
                    <EditRowStyle BackColor="#2461BF" />
                    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                    <HeaderStyle HorizontalAlign="Left" CssClass="normalText" BackColor="#507CD1" Font-Bold="True"
                        ForeColor="White" />
                    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                    <RowStyle BackColor="#EFF3FB" />
                    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                    <Columns>
                        <asp:TemplateField HeaderText="Id">
                            <ItemTemplate>
                                <asp:Label ID="lblCustomerId" runat="server" Text='<%# Bind("ID") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Name">
                            <ItemTemplate>
                                <asp:Label ID="lblCustomerName" runat="server" Text='<%# Bind("Name") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="AddressLine1">
                            <ItemTemplate>
                                <asp:Label ID="lblAddressLine1" runat="server" Text='<%# Bind("AddressLine1") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="AddressLine2">
                            <ItemTemplate>
                                <asp:Label ID="lblAddressLine2" runat="server" Text='<%# Bind("AddressLine2") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Mobile">
                            <ItemTemplate>
                                <asp:Label ID="lblMobile" runat="server" Text='<%# Bind("Mobile") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                         <asp:TemplateField HeaderText="Phone">
                            <ItemTemplate>
                                <asp:Label ID="lblPhone" runat="server" Text='<%# Bind("Phone") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Country">
                            <ItemTemplate>
                                <asp:Label ID="lblCountry" runat="server" Text='<%# Bind("Country") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="State">
                            <ItemTemplate>
                                <asp:Label ID="lblState" runat="server" Text='<%# Bind("State") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="District">
                            <ItemTemplate>
                                <asp:Label ID="lblDistrict" runat="server" Text='<%# Bind("District") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="City">
                            <ItemTemplate>
                                <asp:Label ID="lblCity" runat="server" Text='<%# Bind("City") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:LinkButton ID="linkName" runat="server" Text="Edit" CommandName="displayCustomer"  CommandArgument='<%# Eval("ID")%>' >
                                </asp:LinkButton>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>

Answer 1

you have find the dropdown, fill it first with your state lists then use like

ddlState.Items.FindbyText(lblState.text).Selected=true;

you can try like this

if (e.commandname == "displayCustomer") {
    GridViewRow gv = (GridViewRow)((Control)e.CommandSource).NamingContainer;
    label lblCountry = gv.findControl("lblCountry");
    label lblState = gv.findcontrol("lblState");
    label lblDistrict = gv.findcontrol("lblDistrict");


    //call function to fill your country


    ddlCountry.items.finbytext(lblCountry.text).selected = true;

    //call function to fill states based on ddlcountry selected item

    ddlState.items.finbytext(lblState.text).selected = true;


    //call function to fill district based on ddlStateselected item

    ddlDistrict.items.finbytext(lblDistrict.text).selected = true;



}

Answer 2

Actually you don't need to perform all this code.

Label lblCountry = (Label)row.FindControl("lblCountry");
ddlCountry.SelectedIndex = Convert.ToInt32(lblCountry.Text);
Label lblState = (Label)row.FindControl("lblState");
ddlState.SelectedIndex = Convert.ToInt32(lblState.Text);
Label lblDistrict = (Label)row.FindControl("lblDistrict");
ddlDistrict.SelectedIndex = Convert.ToInt32(lblDistrict.Text);

One better way is :

<asp:LinkButton ID="linkName" runat="server" Text="Edit" CommandName="displayCustomer"  CommandArgument='<%# Eval("ID")%>' ></asp:LinkButton>



public void gvCustomer_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        // Here "i" is the id(CommandArgument='<%# Eval("ID")%>') of the record 
        //coming from the link button.
        int i = Convert.ToInt32(e.CommandArgument);

        if (e.CommandName == "Edit1")
        {

            // Execute your Database query with where condition for "i" 
            // and fetch the value in data reader. The Query will be like 
            // Select * from Table_Name where ID = i
            // This will get you the particular record for that ID only

            while (dr.Read())
            {
                DrpCountry.SelectedItem.Value = dr["CountryID"].ToString();
                DrpState.SelectedItem.Value = dr["StateID"].ToString();
                DrpDistrict.SelectedItem.Value = dr["DistrictID"].ToString();
            }
        }
    }

Answer 3

select a particular value of drop down from

ddlCountry.SelectedIndex=ddlCountry.Items.IndexOf(ddlCountry.Items.FindByText(lblCountry.Text));

Answer 4

UPDATE:

The problem is, when you select the value in your Country DropDown , it is already filled, while your State and City DropDown s are NOT filled that is why they are NOT working,

    protected void gvCustomer_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "displayCustomer")
        {
            GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
            hfCustomerId.Value = Convert.ToString(e.CommandArgument);
            Label lblCName = (Label)row.FindControl("lblCustomerName");
            txtCustomerName.Text = lblCName.Text;
            Label lblAdd1 = (Label)row.FindControl("lblAddressLine1");
            txtAddressline1.Text = lblAdd1.Text;
            Label lblAdd2 = (Label)row.FindControl("lblAddressLine2");
            txtAddressline2.Text = lblAdd2.Text;
            Label lblPhone = (Label)row.FindControl("lblPhone");
            txtPhone.Text = lblPhone.Text;
            Label lblMobile = (Label)row.FindControl("lblMobile");
            txtMobileNumber.Text = lblMobile.Text;
            Label lblCountry = (Label)row.FindControl("lblCountry");


            // -------------------------- changed code --------------------------

            ddlCountry.SelectedIndex = ddlCountry.Items.IndexOf(ddlCountry.Items.FindByText(lblCountry.Text))


            // at this point country should be filled and selected, so we can bind and select appropriate state
            BindStates();

            Label lblState = (Label)row.FindControl("lblState");
            ddlSate.SelectedIndex = ddlSate.Items.IndexOf(ddlSate.Items.FindByText(lblState.Text))

            // at this point states should be filled and selected, so we can bind and select appropriate District
            BindDistricts();


            Label lblDistrict = (Label)row.FindControl("lblDistrict");
            ddlDistrict.SelectedIndex = ddlDistrict.Items.IndexOf(ddlDistrict.Items.FindByText(lblDistrict.Text))

            //---------------------------------------------------------------------

            Label lblCity = (Label)row.FindControl("lblCity");
            txtCity.Text = lblCity.Text; 
        }
    }

As you have mentioned in you comments that Country column in GridView is actually Country Name NOT Country ID. While you are converting this lblCountry.Text into int32 and trying set the index. This should give the error I suppose.

The approach you have currently adopted does NOT seem to right, a better approach may be is to save the ID of the record in the Grid in some HiddenField for example, and on RowCommand , pick the ID from HiddenField , get the data from Database and then load in your input boxes.

Anyway for a workaround, save the CountryID along with your Country Name in a HiddenField ,

<asp:TemplateField HeaderText="Country">
    <ItemTemplate>
        <asp:Label ID="lblCountry" runat="server" Text='<%# Bind("Country") %>'></asp:Label>
        <asp:HiddenField ID="hfCountryID" runat="server" Value='<%# Bind("CountryID") %>'></asp:HiddenField>
    </ItemTemplate>
</asp:TemplateField>

Then you can set the DropDown using this CountryID

var hfCountryID = row.FindControl("hfCountryID") as HiddenField;
ddlCountry.SelectedValue = Convert.ToInt32(hfCountryID.Text); 

Another workaround can be to find the Item using Country Name and select it,

ddlCountry.SelectedIndex = ddlCountry.Items.IndexOf(ddlCountry.Items.FindByText(lblCountry.Text));

Answer 5

您所需要的只是创建一个函数来获取国家或州的 ID 或任何您可以执行的操作：

ddlCounty.SelectedValue=CountyID.ToString();

Answer 6

Try this,

ddlCountry.SelectedIndex = ddlCountry.Items.IndexOf
(ddlCountry.Items.FindByText(lblCountry.Text);