count of list items of dropdownlist on button click

d developer

On each button click, on selection of the dropdownlist item, get the count of selected listitem and put it in a textbox.

Output:

Rajesh: 2(selected 2 times on button click)

Vinay : 5(selected 5 times)

5 Replies

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ramya bharath11y ago
in the case which you have mentioned as I have said earlier create the dictionary on page load as public. On selection change add the dictionary with selected values alone .

I.e on page load create the dictionary

On selection change if rajesh is selected add key as Rajesh vand value as 1.
On selection of vinay add similarly in the dictionary.
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d developer11y ago
Thanks Pankaj and Ramya.

@Pankaj - I have dropdownlists populating from database like dynamically how to do that?
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Nanhe Siddique11y ago
hi d Developer
as per my knowledge multiple selection in dropdownlist is not possible for this you have to use ajax control toolkit . inside this toolkit a control named CheckBoxList cotrol solve your problem
i giving you code in Zip file download and use it

it may help you
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Pankaj Kumar Choudhary11y ago
Hello @D you can try this code in aspx.cs page

static Dictionary Dictionary = new Dictionary();
protected void Page_Load(object sender, EventArgs e)
{
// Load_Data();
if (!IsPostBack)
{
Dictionary.Add("Rajesh", 0);
Dictionary.Add("Vinay", 0);
Dictionary.Add("Hari", 0);
Dictionary.Add("Anand", 0);

}
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (DropDownList1.SelectedValue == "Rajesh")
Dictionary["Rajesh"] = Dictionary["Rajesh"] + 1;
else if (DropDownList1.SelectedValue == "Vinay")
Dictionary["Vinay"] = Dictionary["Vinay"] + 1;
else if (DropDownList1.SelectedValue == "Hari")
Dictionary["Hari"] = Dictionary["Hari"] + 1;
else if (DropDownList1.SelectedValue == "Anand")
Dictionary["Anand"] = Dictionary["Anand"] + 1;
}
protected void Button1_Click(object sender, EventArgs e)
{
foreach (KeyValuePair inr in Dictionary)
{
Response.Write(inr.Key + "= " + inr.Value);
}
Dictionary["Rajesh"] = 0; // here reset the each dictionary value //
Dictionary["Vinay"] = 0; // you can avoid this code if you don't require //
Dictionary["Hari"] = 0;
Dictionary["Anand"] = 0;
}
}

if you have any doubt regarding this answer then please ask.............
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ramya bharath11y ago
As per the description you have given.

On each select you have to check which value has been selected and on button click display the count of total selection.

Steps to be followed.

1. Create a public hash table in your code. Either in server side or client side anything is fine

Am providing an example in JavaScript since c# you can create dictionary objects which is easier

Code 1
var myArray = {Rajesh:0,Vinay:0}:

2. On selection change create a event to check what selection it is and update the value of it

Code 2:

myArray[selectedvalue] = myArray[selectedvalue]+1;

3. On button click call a event to loop through all the elements of the array and append the value in text box

for(key in myArray) {
Displaytextbox.text=Displaytextbox.text+key+":"+myArray[key];
}

Refer this on how to handle associated array in JavaScript http://blog.xkoder.com/2008/07/10/javascript-associative-arrays-demystified/

Refer this on how to do it using dictionary in server side http://www.dotnetperls.com/dictionary
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