public void pdt_data(string lic)

{

string s = "select * from truck where truck_license = "+lic;

FillDataTable(s);

}

Also I don't know if the way I set it up is the problem but I have the followoing code in the leave event of a textbox:

private void Trk_lic_Leave(object sender, EventArgs e)

{

this.truckBO1.Clear();

this.truckBO1.pdt_data(Trk_lic.Text);

if (this.truckBO1.Count > 0)

{

this.trkpdt.Text = this.truckBO1.truck_pdt.ToString();

}

}

This runs the query on the BO and returns a value which is agssigned to the text value of a label if one is found. the problem I am having is that after this the CertFrm_FormEditingStateChanged event is triggered and the form starts back at tab order 0 and the only wayto get to the next textbox after this is to click into it, if you tab through the form you go back to zeo when tabbing out of this textbox.

public bool GetTrucklic(long carrier, out string truckLic)

{

//-- Establish a return var

bool dataFound = false;

//-- Set default return value if there is no value in db.

truckLic = string.Empty;

//-- Build SQL string

StringBuilder sqlBuilder = new StringBuilder();

sqlBuilder.AppendLine("Select count(*)");

sqlBuilder.AppendLine("From truck");

sqlBuilder.AppendLine("Where FK_customer = @carr");

//-- Get data

using (SqlCommand cmd = new SqlCommand())

{

cmd.CommandText = sqlBuilder.ToString();

cmd.Parameters.AddWithValue("@carr", carrier).SqlDbType = SqlDbType.VarChar;

//-- Get Data, handle Null from database and nulls.

// This can return a DbNull.Value (i.e. a NULL from SQL) or it

// can return null (.NET) if there is no matching record in database

// (i.e. an empty recordset is returned). Thus before we can set the

// return variable, we have to test for these cases. It is also important

// to set a default value (as done above), in case no data is found

// in the database.

object result = this.ExecuteScalar(cmd);

if (!DBNull.Value.Equals(result) && result != null)

{

//-- By using an output variable (truckPdt) and a return variable

// (dataFound), I can somewhat simplify the

// client code because I can directly test

// the return value and get the value at the

// same time. It is equally valid to directly

// return the value (truckPdt) and then

// testing if it is a null or empty.

//truckPdt = result.ToString();

if (result.Equals(1))

{

dataFound = true;

}

else

dataFound = false;

}

}

}

if (dataFound)

{

//-- Build SQL string

StringBuilder sqlBuilder2 = new StringBuilder();

sqlBuilder2.AppendLine("Select truck_license");

sqlBuilder2.AppendLine("From truck");

sqlBuilder2.AppendLine("Where FK_customer = @carr");

//-- Get data

using (SqlCommand cmd2 = new SqlCommand())

{

cmd2.CommandText = sqlBuilder2.ToString();

cmd2.Parameters.AddWithValue("@carr", carrier).SqlDbType = SqlDbType.VarChar;

//-- Get Data, handle Null from database and nulls.

// This can return a DbNull.Value (i.e. a NULL from SQL) or it

// can return null (.NET) if there is no matching record in database

// (i.e. an empty recordset is returned). Thus before we can set the

// return variable, we have to test for these cases. It is also important

// to set a default value (as done above), in case no data is found

// in the database.

object result2 = this.ExecuteScalar(cmd2);

if (!DBNull.Value.Equals(result2) && result2 != null)

{

//-- By using an output variable (truckPdt) and a return variable

// (dataFound), I can somewhat simplify the

// client code because I can directly test

// the return value and get the value at the

// same time. It is equally valid to directly

// return the value (truckPdt) and then

// testing if it is a null or empty.

dataFound = true;

}

}

}

//-- Return if data was found.

return dataFound;

}

I am calling this from the enter event of the license textbox. The problem is if a company has more than one truck and therefore more than one license number. I am trying to call a browse dialog by repopulating a BO based on the carriers PK.