How Can I Call A Data To Textbox Using Linq To Sql

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i have this, no error but it doesn't work

POSDataContext pos = new POSDataContext();
Credential c = new Credential();

var q = from m in pos.Credentials where c.UserName == usernamelabel.Text select m;

fnamelabel.Text = c.FirstName;
lnamelabel.Text = c.LastName;
pnumberlabel.Text = c.PhoneNumber;
dateofcreationlabel.Text = c.DateCreated.ToString();
privilegelabel.Text = c.Privilege;

Posted 19-Nov-15 21:02pm

Member 11673987

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Tomas Takac 20-Nov-15 3:11am

Do you realize that c is empty and has no connection to your query whatsoever? You probably want to to populate the textboxes with data from database.

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PANKAJMAURYA · Accepted Answer · 2015-11-19T21:16:00

Solution 1

Probably your code should be like

C#

POSDataContext pos = new POSDataContext();
var q = (from m in pos.Credentials where c.UserName == usernamelabel.Text select new Credential{
FirstName = m.FirstName,
LastName = m.LastName,
PhoneNumber = m.PhoneNumber,
DateCreated = m.DateCreated,
Privilege = m.Privilege
}).Single() ;
fnamelabel.Text = q.FirstName;
lnamelabel.Text = q.LastName;
pnumberlabel.Text = q.PhoneNumber;
dateofcreationlabel.Text = q.DateCreated.ToString();
privilegelabel.Text = q.Privilege;

Posted 19-Nov-15 21:16pm

PANKAJMAURYA

Updated 22-Nov-15 18:59pm

v3

Comments

Tomas Takac 20-Nov-15 3:18am

q will be IQueryable and does not have properties like FirstName or LastName. Please fix.

[no name] 20-Nov-15 3:31am

Thanks ...

Tomas Takac 20-Nov-15 5:13am

Not really what I meant. :) What you have there is still an IEnumerable<Credential> but you want just one Credential - I assume the username is unique. So What you need is to call .Single() on the query. Cheers.

[no name] 23-Nov-15 1:00am

Thanks... Is it right now.

Member 11673987 20-Nov-15 8:25am

I don't get it please .single() as how where will it be???

[no name] 23-Nov-15 1:00am

I have updated the solution using Single() extension method.