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How represent CROSS JOIN load form when add combo national table

How represent CROSS JOIN load form when add combo national table

How represent CROSS JOIN load form when add combo national table

Hi guys I have combobox i want to add in to fillcontroll() function but not accept
this is my data
Table driver
Driver ID
Driver Name
Nationality ID

table nationality
nationality id
nationality name

in load form i want combobox display text is nationality name
and in same time i need to show when navigate record
this is my view in database
SELECT dbo.Driver.DriverName, dbo.Driver.Nationality, dbo.Driver.Address, dbo.Driver.NationalityID, dbo.Nationality.NationalityName


DataSet ds = new DataSet();

SqlDataAdapter da = new SqlDataAdapter();

SqlConnection con = new SqlConnection();


in form load i write following

this.Cursor = Cursors.WaitCursor;
string constr = "Data Source=" + value1 + ";Initial Catalog=" + value2 + ";User ID=" + value3 + ";Password=" + value4 + "";
con = new SqlConnection(constr);
string comdstr = "select * from Driver1view";
da = new SqlDataAdapter(comdstr, constr);
ds = new DataSet();
dt = new DataTable();


dt = ds.Tables["Driver"];

totalrecord = dt.Rows.Count;
this.Cursor = Cursors.Default;
if (totalrecord > 0)

MessageBox.Show("There is no records");


{totalrecord = dt.Rows.Count;


Now my problem is when I want to show combobox in load form it not show and it give me

errors why

textBox1.Text = dt.Rows[currrecord]["DriverID"].ToString();

textBox2.Text = dt.Rows[currrecord]["DriverName"].ToString();

combobox.text = dt.Rows[currrecord]["NationalityName"].ToString();"

textBox4.Text = dt.Rows[currrecord]["Address"].ToString();"

label6.Text = currrecord+1 + "of"+ totalrecord.ToString();

void fillcontrol()int currrecord = 0;
private int totalrecord = 0;dt = new DataTable();

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