Creating a master/detail form datagridview

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hello everyone ...
i cannot understand what is wrong with this code if your could please tell me ..
i wanna show detail data in second datagridview with selecte first "master" datagridview

my sql table is

tblA
ID - Name -Clid
1 - john -1
2 -sam -2

tblb

ID - clas
1 - ID
2 - access

and this is my code

C#

DataSet data = new DataSet();
             data.Locale = System.Globalization.CultureInfo.InvariantCulture;

             SqlDataAdapter masterDataAdapter = new
                 SqlDataAdapter("select * from Tbla", connection);
             masterDataAdapter.Fill(data, "Tbla");

             // Add data from the Orders table to the DataSet.
             SqlDataAdapter detailsDataAdapter = new
                 SqlDataAdapter("select * from Tblb", connection);
             detailsDataAdapter.Fill(data, "Tblb");


             DataRelation relation = new DataRelation("CustomersOrders",
                 data.Tables["Tbla"].Columns["Clid "],
                 data.Tables["Tblb"].Columns["ID"]);
             data.Relations.Add(relation);


             dataGridView1.DataMember = "Customers";
             dataGridView1.DataSource = data;

             dataGridView2.DataSource = dataGridView1;
             dataGridView2.DataMember = "CustomersOrders";
         }

and it showing this error{
This constraint cannot be enabled as not all values have corresponding parent values.}

What I have tried:

i tried to change datarelation with first set tblb and then tbla, and tried to remove data DataMember

Posted 15-Feb-16 7:22am

jame01

Updated 15-Feb-16 8:13am

v2

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Richard Deeming · Accepted Answer · 2016-02-15T07:57:00

If the data you've posted is the entire content of your tables, then it's no wonder you're getting this error. Where is the parent row in tblA for the first row in tblB? According to the definition of your relationship, there should be a row with Clid = 1, but there isn't.

Correct the data in your database, and then set up a FOREIGN KEY constraint[^] between the tables to prevent this sort of problem from occurring again.

If those are your real table names, then you should strongly consider changing them to something more meaningful - for example, Customers and Orders. It will make your life much easier when you come back to maintain this code later.