C# WinForm ต้องการสร้างหลายเงื่อนไขให้กับ Checkbox

public void missShw()
{
SqlConnection conn = new SqlConnection(appConn);
string sql = "SELECT [filesTA].EmpNo,[Employee].Title + ' ' + [Employee].[First Name] + ' ' + [Employee].[Last Name] as 'FullName',[filesTA].ChkDate"
+ ",Convert(nvarchar(5),[filesTA].ChkIn,108) as 'ChkIn',Convert(nvarchar(5),[filesTA].ChkOut,108) as 'ChkOut"
+ ",[filesTA].LateMin"
+ " From [WebSP].[dbo].[filesTA] inner join [WebSP].[dbo].[Employee] on [Employee].EmployeeNo=[filesTA].EmpNo INNER JOIN [WebSP].[dbo].[CompanyData] On [CompanyData].Company = [Employee].Company"
+ " WHERE [filesTA].ChkDate ='" + dateTimePicker.Value.ToString("yyyy-MM-dd") + "'"
+ " and [Employee].Section = '" + cbSection.SelectedValue + "'"
+ " and [Employee].Team = '" + cbTeam.SelectedValue + "'"
+ " and [filesTA].ErrorCode = '2'";

da = new SqlDataAdapter(sql, Conn);
DataSet ds = new DataSet();
da.Fill(ds);
Conn.Close();

dgvShow.DataSource = ds.Tables[0];
}

public void leaveFull()
{
SqlConnection conn = new SqlConnection(appConn);
string sql = "SELECT [filesTA].EmpNo,[Employee].Title + ' ' + [Employee].[First Name] + ' ' + [Employee].[Last Name] as 'FullName',[filesTA].ChkDate"
+ ",Convert(nvarchar(5),[filesTA].ChkIn,108) as 'ChkIn',Convert(nvarchar(5),[filesTA].ChkOut,108) as 'ChkOut"
+ ",[filesTA].LateMin"
+ " From [WebSP].[dbo].[filesTA] inner join [WebSP].[dbo].[Employee] on [Employee].EmployeeNo=[filesTA].EmpNo INNER JOIN [WebSP].[dbo].[CompanyData] On [CompanyData].Company = [Employee].Company"
+ " WHERE [filesTA].ChkDate ='" + dateTimePicker.Value.ToString("yyyy-MM-dd") + "'"
+ " and [Employee].Section = '" + cbSection.SelectedValue + "'"
+ " and [Employee].Team = '" + cbTeam.SelectedValue + "'"
+ " and [filesTA].ErrorCode = '3'";

da = new SqlDataAdapter(sql, Conn);
DataSet ds = new DataSet();
da.Fill(ds);
Conn.Close();

dgvShow.DataSource = ds.Tables[0];
}

//ขาดงาน
private void checkBox4_CheckedChanged(object sender, EventArgs e)
{
if (checkBox4.Checked == true)
{
missShw();
}
}

//ลากิจ
private void checkBox3_CheckedChanged(object sender, EventArgs e)
{
if (checkBox3.Checked == true)
{
leaveFull();
}
}