Undefined is not a valid value for int64

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Hello,
I came across this error recently and I don't understand what to do

There is a hidden filed

<asp:hiddenfield id="hfResourceID" runat="server" value="0">

and I am collecting this value like

long resourceId = Convert.ToInt64(hfResourceID.Value); and the error comes here

private void searchGlobal()
{
enResourceType resourceType =
Request.QueryString["ResourceGroupType"] != string.Empty
? (enResourceType)Enum.ToObject(typeof(enResourceType), Convert.ToInt16(Request.QueryString["ResourceGroupType"]))
: enResourceType.Both;

if (resourceType == enResourceType.Network &&
Request.QueryString["From"] == "GlobalResourceGroupRequest")
plhCreateNewNetwork.Visible = true;

string requestID = (Request.QueryString["RequestID"] != null) ? (string)Request.QueryString["RequestID"] : "0";

grdResources.DataSourceID = "ResourceDataSource";

ResourceDataSource.SelectMethod = "SearchGlobal";
ResourceDataSource.SelectParameters.Clear();
ResourceDataSource.SelectParameters.Add("name", txtName.Text);
ResourceDataSource.SelectParameters.Add("requestID", requestID);
ResourceDataSource.SelectParameters.Add("resourceType", resourceType.ToString());
ResourceDataSource.SelectParameters.Add("folioID", folioID.Text);

grdResources.DataBind();
}

This line throws error grdResources.DataBind();

I don't understand what to do here? Please help

What I have tried:

tried to change Convert.ToInt64 to Convert.ToInt16 but didn't work.

Posted 8-Jan-22 22:40pm

Member 14362033

Updated 8-Jan-22 23:02pm

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OriginalGriff · Answer 1 · 2022-01-08T23:02:00

Look at the affected line of code, and at the error message:

Undefined is not a valid value for int64

C#

long resourceId = Convert.ToInt64(hfResourceID.Value);

What it's saying is that there is no value in hfResourceID.Value, so it can;t be made into a long integer value.

If you use the debugger to view the content of hfResourceID.Value you will probably get a null value because either your code or the user has not set it to anything. Probably, this means that there is a NULL value in your database that you aren't expecting, and you need to sort out your data integrity first - but we have no access to any of your data so we can;t even check, much less fix it!

If that isn't the case, then either give it a default value that will make sense to the rest of your code, or check for invalid values and report an error instead of continuing as if it was correct.