Adding new row to listview removes above selected dropdown Clearing

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C#

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                FirstListViewRow();
                BindDataToGridviewDropdownlist();
            }
        }
        protected void BindDataToGridviewDropdownlist()
        {
            DataSet dsDept = new DataSet();
            dsDept.ReadXml(Server.MapPath("XMLFile2.xml"));
            DataView dv = dsDept.Tables[0].DefaultView;
            foreach (var list in listview1.Items)
            {
                if (list.ItemType == ListViewItemType.DataItem)
                {
                    DropDownList ddf = (DropDownList)list.FindControl("ddldatatype");
                    ddf.DataSource = dv;
                    ddf.DataTextField = "value";
                    ddf.DataBind();
                    ddf.Items.Insert(0, new ListItem("--Select--", "0"));
                }
            }
        }
        private void FirstListViewRow()
        {
            DataTable dt = new DataTable();
            DataRow dr = null;
            dt.Columns.Add(new DataColumn("OrderNo", typeof(string)));
            dt.Columns.Add(new DataColumn("ColumnTitle", typeof(string)));
            dt.Columns.Add(new DataColumn("Datatype", typeof(string)));
            dt.Columns.Add(new DataColumn("Examples", typeof(string)));
            dt.Columns.Add(new DataColumn("Options", typeof(string)));
            dt.Columns.Add(new DataColumn("Delete", typeof(string)));
            dr = dt.NewRow();
            dt.Rows.Add(dr);
            dr["OrderNo"] = 1;
            Session["CurrentTable"] = dt;
            listview1.DataSource = dt;
            listview1.DataBind();
        }
       
        private void AddNewRow()
        {
            int rowIndex = 0;
            if (Session["CurrentTable"] != null)
            {
                DataTable dtCurrentTable = (DataTable)Session["CurrentTable"];
                DataRow drCurrentRow = null;
                if (dtCurrentTable.Rows.Count > 0)
                {
                    for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                    {
                        Label TextBoxorder = (Label)listview1.Items[rowIndex].FindControl("txtorder");
                        TextBox TextBoxcolumnname = (TextBox)listview1.Items[rowIndex].FindControl("txtcolumnname");
                        DropDownList DropDatatype = (DropDownList)listview1.Items[rowIndex].FindControl("ddldatatype");
                        DropDownList Dropexample = (DropDownList)listview1.Items[rowIndex].FindControl("ddlexamples");
                        TextBox TextBoxoptions = (TextBox)listview1.Items[rowIndex].FindControl("txtoptions");
                        CheckBox Checkdel = (CheckBox)listview1.Items[rowIndex].FindControl("chkdel");

                        drCurrentRow = dtCurrentTable.NewRow();
                        drCurrentRow["OrderNo"] = i + 1;

                        // dtCurrentTable.Rows[i - 1]["Order"] = TextBoxorder.Text;
                        dtCurrentTable.Rows[i - 1]["ColumnTitle"] = TextBoxcolumnname.Text;
                        dtCurrentTable.Rows[i - 1]["Datatype"] = DropDatatype.Text;
                        dtCurrentTable.Rows[i - 1]["Examples"] = Dropexample.Text;
                        dtCurrentTable.Rows[i - 1]["Options"] = TextBoxoptions.Text;
                        dtCurrentTable.Rows[i - 1]["Delete"] = Checkdel.Text;

                        rowIndex++;
                    }
                    dtCurrentTable.Rows.Add(drCurrentRow);
                    Session["CurrentTable"] = dtCurrentTable;
                    listview1.DataSource = dtCurrentTable;
                    listview1.DataBind();
                    Label txn = (Label)listview1.Items[rowIndex].FindControl("txtorder");
                    txn.Focus();
                }
            }
            else
            {
                Response.Write("Session is null");
            }
            BindDataToGridviewDropdownlist();
        }
        protected void btnGenerate_Click(object sender, EventArgs e)
        {


        }
        protected void btnAdd_Click(object sender, EventArgs e)
        {
            AddNewRow();
        }

        protected void btndelete_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            if (Session["CurrentTable"] != null)
            {
                dt = (DataTable)Session["CurrentTable"];
                int j = 0;
                for (int i = 0; i < listview1.Items.Count; i++)
                {
                    ListViewDataItem items = listview1.Items[i];
                    CheckBox chkBox = (CheckBox)items.FindControl("chkdel");

                    if (chkBox.Checked == true)
                    {
                        dt.Rows.RemoveAt(j);
                        dt.AcceptChanges();
                    }
                    else
                    {
                        j++;
                    }
                }
                Session["CurrentTable"] = dt;
                listview1.DataSource = dt;
                listview1.DataBind();
                BindDataToGridviewDropdownlist();
            }
        }

        protected void btnClear_Click(object sender, EventArgs e)
        {
            listview1.Items.Clear();
        }
    }
}

Posted 2-Oct-13 19:29pm

karthik mushyam

Updated 2-Oct-13 19:39pm

Azee

v2

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Comments

karthik mushyam 3-Oct-13 1:35am

When i add the new row to the List view above selected dropdownlist gets cleared .what is the reason for this problem plz suggest me

Azee 3-Oct-13 1:41am

Is the DropDownList that is clearing, inside the ListView?

karthik mushyam 3-Oct-13 1:44am

listview has dropdownlist column ..when i select dropdownlist value and add new row to the listview ..above selected dropgown gets cleared this is the exact problem with this

Azee 3-Oct-13 1:50am

You are binding the ListView in your AddRow method,
listview1.DataSource = dtCurrentTable;
listview1.DataBind();

It will reset all data inside the ListView, hence reseting the DropDownLists.

Do you want to keep the state of that dropdownlist?

karthik mushyam 3-Oct-13 1:52am

yes

karthik mushyam 3-Oct-13 1:54am

plz help me Azee ..what i want to do for this

Azee 3-Oct-13 2:02am

You have droplistcolumn and you are bind the values in your code,
does the selection of the DropDownList's values is based on data from dtCurrentTable?
that you are binding to the ListView? and which DropDown is it ddldatatype or ddlexamples

karthik mushyam 3-Oct-13 2:06am

ddldatatype

Azee 3-Oct-13 2:07am

there are two question in my above comment, please answer the first one.

karthik mushyam 3-Oct-13 2:08am

That is next step based on the value selected in ddtdatatype, ddlexample items will get .

karthik mushyam 3-Oct-13 2:13am

Dropdownlist ddldatatype data is from xml

karthik mushyam 3-Oct-13 2:23am

yes

karthik mushyam 3-Oct-13 2:08am

That is next step based on the value selected in ddtdatatype, ddlexample items will get.

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**Azee** · Accepted Answer · 2013-10-02T20:22:00

Hey there,

I am not still sure about your problem, but here is what I think it is.

You want the DropDownLists of the column have a selected value from the Datatype Column of the DataTable that the GridView is binding from.

You can do two modifications and can make the selection this way:
Add a property DataKeyNames in this ListView like this:

ASP.NET

<asp:listview id="listview1" runat="server" datakeynames="Datatype" xmlns:asp="#unknown"></asp:listview>

and add these lines inside BindDataToGridviewDropdownlist method:

C#

ListViewDataItem di = (ListViewDataItem)list;
                    string dataType = listview1.DataKeys[di.DisplayIndex].Values[0].ToString();
                    ddf.SelectedValue = dataType;

here is how you BindDataToGridviewDropdownlist method would look like:

C#

protected void BindDataToGridviewDropdownlist()
       {
           DataSet dsDept = new DataSet();
           dsDept.ReadXml(Server.MapPath("XMLFile2.xml"));
           DataView dv = dsDept.Tables[0].DefaultView;
           foreach (var list in listview1.Items)
           {
               if (list.ItemType == ListViewItemType.DataItem)
               {
                   DropDownList ddf = (DropDownList)list.FindControl("ddldatatype");
                   ddf.DataSource = dv;
                   ddf.DataTextField = "value";
                   ddf.DataBind();
                   ddf.Items.Insert(0, new ListItem("--Select--", "0"));

                   ListViewDataItem di = (ListViewDataItem)list;
                   string dataType = listview1.DataKeys[di.DisplayIndex].Values[0].ToString();
                   ddf.SelectedValue = dataType;
               }

           }
       }

Let me know if it works or not, and most importantly this is what you wanted.

Azee...