Checking Status of checkbox with a variable. checkbox(i).checked ?

Question

I have 30 checkboxes in my web form, and i want to store the status of checkboxes in a array of bool. now since asp.net doesn't accept using the "checked" status of a checkbox with a variable like "i" ,problem is i don't know how to perform the code!

i want something like this:

bool[] array = new bool[30];
for (int i = 0; i < 30; i++)
   {
      array[i] = CheckBox(i).Checked ;
   }

when you run the above code you'll get this error:

Compilation Error 
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

Compiler Error Message: CS0118: 'System.Web.UI.WebControls.CheckBox' is a 'type' but is used like a 'variable'

Source Error:

Line 109:        for (int i = 0; i < 30; i++)
Line 110:        {
Line 111:            array[i] = CheckBox(i).Checked;
Line 112:        }
Line 113:

I exactly want to know how can i use IDs of checkboxes with a variable, like:

i = 15;
CheckBox(i).Checked

instead of:

CheckBox15.Checked

ASP.net 4 and c# Thank you Guys.

Alvin · Accepted Answer · 2011-11-12 14:25:31Z

1

try this:

bool[] array = new bool[30];
for (int i = 0; i < 30; i++)
{
   array[i] = ((CheckBox)Page.FindControl("CheckBox" + i.ToString)).Checked;
}

UPDATE:

I just created a new project just to test if the codes are working, and it worked. really. :|

<body>
    <form id="form1" runat="server">
    <div>
        <asp:CheckBox ID="CheckBox1" runat="server" />
        <asp:CheckBox ID="CheckBox2" runat="server" />
        <asp:CheckBox ID="CheckBox3" runat="server" />
        <asp:CheckBox ID="CheckBox4" runat="server" />
        <asp:CheckBox ID="CheckBox5" runat="server" />
        <asp:CheckBox ID="CheckBox6" runat="server" />
        <asp:CheckBox ID="CheckBox7" runat="server" />
        <asp:CheckBox ID="CheckBox8" runat="server" />
        <asp:CheckBox ID="CheckBox9" runat="server" />
        <asp:CheckBox ID="CheckBox10" runat="server" />
    </div>
    </form>
</body>

code-behind:

public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        bool[] array = new bool[10];
        for (int i = 1; i <= 10; i++)
        {
            array[i] = ((CheckBox)Page.FindControl("CheckBox" + i.ToString())).Checked;
        }
    }
}

edited Nov 12, 2011 at 14:25

answered Nov 12, 2011 at 12:08

Alvin

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4 Comments

Mahyar Kakaee Over a year ago

It came With Error: "Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: Line 111: array[i] = ((CheckBox)Page.FindControl("CheckBox" + i.ToString())).Checked;" But thanks @vhinn terrible

Alvin Over a year ago

Do you have a Checkbox whose ID is "CheckBox0"? if none, of course it will return NULL as it didnt see a control like that. change your for loop to start with 1 and not 0!

Mahyar Kakaee Over a year ago

It's not because of that. I did what you told ans the result was the same, I also did: bool con = ((CheckBox)Page.FindControl("CheckBox10")).Checked; and it was the same. you'll wonder if i say i also tried this: string str = ((CheckBox)Page.FindControl("CheckBox10")).ID.ToString(); and result was just the same. i think it can't fine the specific control with this method at all!

Mahyar Kakaee Over a year ago

Well thank you Vhinn, It worked. But with a tiny change.bool[] array = new bool[11]; That's all. thank you again.

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