Develop Reference

Model Binding is not happening with DropDownList

Here is the link to MVC dotnetfiddle: https://dotnetfiddle.net/k1E6nG
I have a property called as "Result" in my ViewModel which is a List.
Output is an table which can dynamically add rows & each row is an combination of different inputs( like Dropdown & Text Box).
Controller:
rows.Add(new Row() { SQ1 = "2", SQ2 = "Arun", SQ3 = "kumar" });
I am assigning Values to individual Row. In the output, I can see the values getting populated in Text Boxes( Arun & kumar) whereas the DropDown list is not showing the selected value i.e DropDownList in 1st Row should show Benz as selected value

Add an additional parameter to your select list, like this:
<td> #Html.DropDownListFor(model => model.Result[i].SQ1, new SelectList(Model.DDlist,"Value", "Text", Model.Result[i].SQ1)) </td>
Select list takes an optional argument for the selected value, so you can set your selected value there.

How to fetch the Item Property/Fields in Sitecore?

I am trying to fetch a field called footer from the Item FooterComponent and want to display.This is the code I have tried but cannot fetch and display.
cs code:
Item footerText=Sitecore.content.Database.GetItem(GUID);
string MyFooter=FooterText["Footer"];
txtFooter.Item = MyFooter;
ascx code:
<sc:fieldrenderer runat="server" id="txtFooter" fieldname="Footer"/>

You should not set a string value of the field to the field renderer. Just set correct item and field name:
Item footerTextItem = Sitecore.content.Database.GetItem(GUID);
txtFooter.Item = footerTextItem;
<sc:fieldrenderer runat="server" id="txtFooter" fieldname="Footer"/>
See more information here: https://sitecoresandbox.com/tag/fieldrenderer/
Also read What's a good way to set the Item or DataSource attribute of a FieldRenderer?

combobox item selected To be fixed

I had a databound combobox in my windows form I populate it by a function deptload() IN FORM LOAD
public void DeptcomboLoad()
{
DataTable dt = depttrans.getDeptName();
Cmb_Department.DataSource = dt;
Cmb_Department.DisplayMember = "DepartmentName"; //CHAR
Cmb_Department.ValueMember = "DepartmentPK"; //INT
}
Now when an employee of a department (say accounts DepartmentName="Accounts " , DepartmentPK=23 ) login I want the ComboBox text to be selected as "acounts "
and when I go to get the selected value of the ComboBox I should get 23
I tried
Cmb_Department.selectedtext="Accounts"
Cmb_Department.Text="Accounts"
but its not giving the selected value
Can anyone give a suggestion

Instead of trying to put a value INTO the combobox, try to GET the SelectedItem like this:
string txt= Cmb_Department.SelectedItem.Text
or just:
string txt= Cmb_Department.SelectedText

To change selected value of the combobox you can use
SelectedItem property or SelectedIndex.
Index must be exact number in your data sourse, and Item must be exact object from datasource

You can get it to select the right item by issuing something like this:
Cmb_Department.SelectedValue = 23;
Where 23 comes from some other variable, maybe on another object, maybe from a local variable, whatever works in your case.
Now, to get the selected value you can use this statement:
var val = Cmb_Department.SelectedValue;
To get the selected text (which would be the text associated with the value):
var text = ((DataRow)Cmb_Department.SelectedItem)["DepartmentName"];
The reason I'm prescribing the aforementioned is because the SelectedText property is volatile, and the Text property doesn't always work based on how the DropDownStyle is set.
However, some would probably argue to get the same as the aforementioned you could issue this statement:
var text = Cmb_Department.Text;

grid view search using dropdown list and text box filter?

Sir/madam now my problem is this that I want to filter the Grid View of a page using a Drop Down list and a text box.
I mean to say like we write a SQL such as:
Select * from student where roll_no = 101;
Right,
Now I what that the column (roll_no in above statement) should be selected by the drop down list and the value (101 in the above statement) should be entered by the Text box.
In short I want to populate my grid view using Drop Down list and the value of text box by clicking a button..
For developing i am using dataset and table adapters.
Please, help me for this..

I use a drop-down list (combo-box) and a textbox to filter my DataGridView the following way and I think this is what you are looking for.
First, populate your DataGridView. You state you are using a DataSet and TableAdapters. I am guessing that you are using a BindingSource to tie your Data to your DataGridView. If that is the case, then you can Filter your data via the BindingSource.
My set up is similar to this:
My combobox contains the fields that I want to use in my Filter and the textbox is the value that I will be applying. The values in the combobox are user-friendly names so they will understand which field they are filtering on.
The code to apply the filter is:
private void ApplyFilter()
{
var filterEntered = FilterTextBox.Text.Trim().ToLower();
MyBindingSource.RemoveFilter(); // remove previous filter
string filterText = string.Empty;
string filterComboText = string.Empty;
switch (FilterComboBox.Text)
{
case "Profile":
filterComboText = "TSProfile"; // column name in the query
break;
case "User Id":
filterComboText = "TSUserId";
break;
case "Center":
filterComboText = "TSCenter";
break;
case "Prefix":
filterComboText = "TSPrefix";
break;
}
filterComboText = filterComboText + " = '";
filterText += (string.IsNullOrEmpty(filterComboText) ? string.Empty : filterComboText);
filterText += (!string.IsNullOrEmpty(filterText) && !string.IsNullOrEmpty(filterEntered) ? filterEntered + "'" : string.Empty);
MyBindingSource.Filter = filterText;
}
Basically what it is doing, is getting the text name of the combo-box and then the text in the textbox and applying the Filter to the BindingSource.
MSDN has an article on Filtering thats contains full sample code.
The one thing that I recommend is to provide the user with a way to easily remove the filter, I use a Remove Filter button.

it would be helpful if you showed us a little code first..
you could try something like this tho:
in your codebehind, add items to your dropdownlist.
List<yourObject> list = new List<yourObject>();
foreach (yourObject i in list)
{
DropdownList1.Items.Add(new ListItem("" i.name, "" + i.id));
}
im just giving an example here, i.name could be the name of a certain student, i.id would be the id associated with that given student.
Make sure you have the autopostback attribute of your dropdownlist set to true, like this:
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
Then in the selected Index Changed event of your dropdownlist, do the following:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
yourDataControl.DataSource = someMethod(Convert.toInt32(DropDownList1.SelectedValue));
yourDatacontrol.DataBind();
}
as i said, im not entirely sure what you're trying to do or how you're trying to do it.
the way i'm describing, you dont need the textbox to enter a certain value, by selecting an item in the dropdownlist you wil automatically get a value: in this case the ID associated with the selected item in the dropdownlist.

Dropdown List will not populate

I'm not sure how to correct the following problem. I have dropdown list that has a object data source. Then in the code there is a method like this
void InitPageData()
{
MembershipUser user = Membership.GetUser();
DataSetTableAdapters.MemberInfoTableAdapter da = new DataSetTableAdapters.MemberInfoTableAdapter();
DataSet.MemberInfoDataTable dt = da.GetMember((Guid)user.ProviderUserKey);
if (dt.Rows.Count == 1)
{
DataSet.MemberInfoRow mr = dt[0];
//rank.Text = mr.rank;
//position.Text = mr.position;
UserName.Text = user.UserName;
...
}
This method populates form fields on the page. What I'm trying to do is to have the rank dropdown list populated from the ods but use this method above to populate the selected item of the rank dropwon list with the line rank.Text = mr.rank. In this example the the line of code that throws the error is commented out otherwise it throws this: "'rank' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value".
I've chaned the code to rank.DataTextFiled = mr.rank and rank.DataValueField = mr.rankid.ToString() but this threw another error: "DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Star'." "Star" is the value of the mr.rank.
Here is what the dropdown list and the ods look like:
<asp:DropDownList runat="server" ID="rank" CssClass="txtfield" DataSourceID="ODCRanks"
DataTextField="Rank" DataValueField="ID" AppendDataBoundItems="True">
<asp:ListItem Text="--- Select a Rank ---" Value="-1" />
<asp:ObjectDataSource ID="ODCRanks" runat="server"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetRanks"
TypeName="RanksTableAdapters.RankTableAdapter"></asp:ObjectDataSource>

You should try adding data columns to your data tables (with ID and Rank being the column name) so that the data can be binded to control.

The Text property sets it by value.
See http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol.text.aspx
You seem to have what will be the text associated with the value and you want to set that as the selected item. I guess this mostly because your value collection is bound to something called ID and I figure a rank of Star isn't an ID.
If Star is what will show up as something in DataTextField, use the items collection FindByText method to select it.
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listitemcollection.findbytext.aspx
Example
ListItem li = DropDownList1.Items.FindByText("one");
if (li != null) li.Selected = true;
If Star is indeed an ID, then check that the collection is fully loaded before trying to select anything in it.

try something like
rank.SelectedIndex = rank.Items.IndexOf(rank.Items.FindByText(mr.rank));