what is the use of " : ,? " etc... in C#

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1.44/5 (2 votes)

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i saw some coding like ....

C#

cmbPosition.SelectedValue == null ? 0 : cmbPosition.SelectedValue;

<pre lang="c#">bnk.PartyWise = Convert.ToBoolean(cmbParty.SelectedIndex == -1 ? false : true);

i did't got the meaning of the code...
and what is the use of ?,: symbols ?????
how to use that symbols ?????

Thanks

Posted 13-Dec-13 18:32pm

An@nd Rajan10

Updated 13-Dec-13 18:45pm

v4

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BillWoodruff 14-Dec-13 2:36am

If you select the "?" in the code examples you show and hit F1, Visual Studio Help will take you to the documentation for the conditional operator syntax (test) ? (if true) : (if false);

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adriancs · Accepted Answer · 2013-12-13T18:46:00

Solution 1

this

C#

cmbPosition.SelectedValue == null ? 0 : cmbPosition.SelectedValue;

is equal to:

C#

if (cmbPosition.SelectedValue == null)
{
    return 0;
}
else
{
    return cmbPosition.SelectedValue;
}

and this:

C#

bnk.PartyWise = Convert.ToBoolean(cmbParty.SelectedIndex == -1 ? false : true)

is equal to:

C#

if (cmbParty.SelectedIndex == -1)
{
    bnk.PartyWise = false;
}
else
{
    bnk.PartyWise = true;
}

Posted 13-Dec-13 18:46pm

adriancs

Updated 13-Dec-13 18:51pm

v5

Comments

An@nd Rajan10 14-Dec-13 0:54am

thanks ....
some coding using like double question mark (??), what is that?

adriancs 14-Dec-13 0:56am

for example?

An@nd Rajan10 14-Dec-13 1:02am

ya i understand .....

Convert.ToDouble(txtTotPremium.Text == null ? "0" : txtTotPremium.Text) + Convert.ToDouble(dgvReleaseOrder.Rows[row].Cells["PremiumAmt"].Value == null ? "0" : dgvReleaseOrder.Rows[row].Cells["PremiumAmt"].Value))

An@nd Rajan10 14-Dec-13 1:03am

thank u so much