Check if record already exist using LINQ to sql

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HI:
I'm using LINQ to sql with c#
I have a text box on a web page , after entering a value to that box
I need to validate whither if this value exist in myTable or not

C#

Var xmyTable = (from ymyTable in objDataContext.myTables
                              Select new 
                             {
                               ymyTable.myCode
                              ymyTable.myNmae
                             }

please help

Posted 17-Jul-14 0:28am

m_solaiman

Updated 1-Mar-21 0:40am

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arunrv · Answer 1 · 2014-07-17T06:29:00

Hi you can write query like this using lambda expresion

http://stackoverflow.com/questions/6330682/select-count-in-linq-to-sql-c-sharp[^]

C#

if(objDataContext.myTables.Count((a)=>a.name=="some name")==0)
{
//Record not present
}
else
{
//Record is present
}

C#

(a)=>a.name=="some name"

is for where condition
hope it is helpful to you.

sibeesh · Answer 2 · 2014-07-17T06:42:00

Solution 3

C#

var v=objDataContext.myTables.FirstOrDefault(p=>p.myCode=text box value);
if (!v=Null)
{
}

Hope it helps

Posted 17-Jul-14 6:42am

sibeesh

Pravuprasad · Answer 3 · 2014-07-17T01:15:00

1st of all store the textbox's value in a string and retrieve value from database matching that sting. here i am taking name as the textbox's value.

C#

 string s = textBox1.text;
var xmyTable = (from ymyTable in objDataContext.myTables where ymyTable.myName == s
                  Select new {ymyTable.myCode,ymyTable.myNmae}).FirstorDefault();
if(xmyTable.Count>0)
{
//your logic for record found.
} 
else
{
//your logic for record not found
}

Ajay K.N · Answer 4 · 2021-03-01T00:40:00

Solution 4

string s = textBox1.text.Trim();
if (!objDataContext.table1.Any(a => a.col1 == s))
{//put insert statement
}

Posted 1-Mar-21 0:40am

Ajay K.N

Check if record already exist using LINQ to sql

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