How can I retrieve the primary key of the selected item in a combobox?

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C#

SqlDataAdapter adapter2 = new SqlDataAdapter("SELECT * FROM dbo.OrderLines", cn);

adapter2.InsertCommand = new SqlCommand("dbo.InsertOrderLine", cn);
adapter2.InsertCommand.CommandType = CommandType.StoredProcedure;

adapter2.InsertCommand.Parameters.Add(new SqlParameter("@ServiceProviderID", SqlDbType.Int, 15, "ServiceProviderID"));
adapter2.InsertCommand.Parameters.Add(new SqlParameter("@ProductID", SqlDbType.Int, 15, "ProductID"));
adapter2.InsertCommand.Parameters.Add(new SqlParameter("@PolicyNumber", SqlDbType.NVarChar, 50, "PolicyNumber"));

SqlParameter parameter2 = adapter.InsertCommand.Parameters.Add("@ID2", SqlDbType.Int, 0, "OrderLineID");
parameter2.Direction = ParameterDirection.Output;

DataTable orderline = new DataTable();
adapter.Fill(orderline);

// find primary key of both productComboBox.SelectedItem from Products table
// and serviceProviderCombobox.SelectedItem from ServiceProviders table
DataRow newRow2 = orderline.NewRow();
newRow2["ServiceProviderID"] = ?serviceProviderComboBox.SelectedItem?;
newRow2["ProductID"] = ?productComboBox.SelectedItem?;
newRow2["PolicyNumber"] = policyTextBox.Text;
orderline.Rows.Add(newRow2);

adapter.Update(orderline);

id2 = int.Parse(parameter2.Value.ToString());

Posted 20-Aug-14 2:15am

Member 11012401

Updated 20-Aug-14 2:41am

Thanks7872

v2

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[no name] 20-Aug-14 8:23am

Is there a question mixed in with your unformatted code somewhere?

Thanks7872 20-Aug-14 8:41am

:laugh: :laugh: :laugh: :laugh:

Member 11012401 20-Aug-14 8:30am

I just added question marks around serviceProviderComboBox.SelectedItem and productComboBox.SelectedItem. I don't know what put here. Sorry, I am very new to this. I apologise if it is a mess.

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Member 11012401 · Answer 1 · 2014-08-20T05:54:00

Solution 2

Realised that the "SelectedValue" already contained the primary key. Assigned it to variables.

Added these two lines:

int spid = int.Parse(serviceProviderComboBox.SelectedValue.ToString());
int pid = int.Parse(productComboBox.SelectedValue.ToString());

Posted 20-Aug-14 5:54am

Member 11012401

Kamran Ayati · Answer 2 · 2014-08-20T02:31:00

Solution 1

you must write a select query that return primary key

query= select combobox.selectedvalue(or selected text) from table.(yourtable name)
where primarykey= X Y or else

Posted 20-Aug-14 2:31am

Kamran Ayati

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Member 11012401 20-Aug-14 9:49am

Thank you for the response. As i said, i'm still very new to c# so i am not sure exactly how to implement your solution. would it look something like this? ...

SqlCommand cmd = new SqlCommand("SELECT serviceProviderComboBox.SelectedValue FROM ServiceProviders WHERE ServiceProviderID = ServiceProviderID", cn);

cmd.CommandType = CommandType.Text;

SqlDataReader reader;

cn.Open();
reader = cmd.ExecuteReader();
cn.Close();

int spid = Convert.ToInt32(reader.ToString());