textbox value will check DropDownList value is there or not

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i have problem for textbox.text value check dropdownlist value check? help me.

bool tt = Convert.ToBoolean(DropDownList1.Items.FindByText(TextBoxNew.Text));
                if(tt = true)
{
label.text ="name not exist";
}
else
{
label.text ="name exist";
}

Unable to cast object of type 'System.Web.UI.WebControls.ListItem' to type 'System.IConvertible'.

thanks karthikeyan, bangalore.

Posted 10-Dec-10 4:25am

pkarthionline

Updated 12-Dec-10 23:49pm

Toniyo Jackson

v2

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Toniyo Jackson 13-Dec-10 5:49am

Always put your code inside code block.

3 solutions

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Saksida Bojan · Answer 1 · 2010-12-10T04:47:00

witch line was it that threw exception?

1st Problem: if statement is incoret, when you compare you must use == instead of a single =. Like this:

C#

if (tt == true)
{
}

2nd Problem: FindByText returns as ListItem instead of Text. Try this:

C#

bool tt = Convert.ToBoolean(DropDownList1.Items.FindByText(TextBoxNew.Text).Text);

ps: I am not behined Visual studio so i do not know the accuarty of the answer

Sandeep Mewara · Answer 2 · 2010-12-10T04:50:00

Solution 2

Error must be in this line:

C#

bool tt = Convert.ToBoolean(DropDownList1.Items.FindByText(TextBoxNew.Text));

Clearly you are trying to use a bool convert on a dropdown listitem's text. Not allowed.

Just find the text and if you don't find then it does not exist or else exist.

Posted 10-Dec-10 4:50am

Sandeep Mewara

pkarthionline · Answer 3 · 2010-12-12T23:46:00

Solution 3

Hai ,
Answer is...

protected void Button1_Click(object sender, EventArgs e)
    {
        //bool tt = Convert.ToBoolean(DropDownList1.Items.FindByText(TextBoxNew.Text));
        ListItem tt = DropDownList1.Items.FindByText(TextBoxNew.Text);
        if (tt == null)
        {
            label.Text = "name not exist";
        }
        else
        {
            label.Text = "name exist";
        }
    }

Karthikeyan Bangalore.

Posted 12-Dec-10 23:46pm

pkarthionline

Updated 12-Dec-10 23:50pm

v2

Comments

Toniyo Jackson 13-Dec-10 5:51am

Always put your code inside code block

pkarthionline 13-Dec-10 6:28am

Previous i got this error.
Unable to cast object of type 'System.Web.UI.WebControls.ListItem' to type 'System.IConvertible'.

now ok.

senguptaamlan 13-Dec-10 6:42am

please mark this thread as answer....by doing that it will help other as well as the author :)