Adding Label Values as Int

protected void Page_Load(object sender, EventArgs e)

{

if (Session["username"] != null)

{

Label1.Text = Session["username"].ToString();

}

con.Open();

SqlCommand cmd = new SqlCommand("SELECT FullName FROM Student WHERE Username= '" + Label1.Text + "'", con);

SqlDataReader reader = cmd.ExecuteReader();

reader.Read();

Label1.Text = reader["FullName"].ToString();

reader.Close();

con.Close();

GetID();

GetCourse();

//con.Open();

//string sql = "SELECT SubjectName,CreditHours FROM Subjects WHERE Course='" + Label5.Text + "'";

//SqlCommand com = new SqlCommand(sql, con);

//SqlDataReader dr;

//dr = com.ExecuteReader();

//CheckBoxList1.DataValueField = "SubjectName";

//CheckBoxList1.DataTextField = "SubjectName";

//CheckBoxList1.DataSource = dr;

//CheckBoxList1.DataBind();

Label6.Visible = true;

Label7.Visible = true;

Label8.Visible = true;

Label9.Visible = true;

Label10.Visible = true;

Label11.Visible = true;

Label12.Visible = true;

Label6.Text = "";

Label7.Text = "";

Label8.Text = "";

Label9.Text = "";

Label10.Text = "";

Label11.Text = "";

Label12.Text = "";

}

public void GetID()

{

Label2.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT Student_ID FROM Student WHERE Username= '" + Session["username"].ToString() + "'", con);

Label4.Text = cmd.ExecuteScalar().ToString();

con.Close();

}

public void GetCourse()

{

Label2.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT Course FROM Student WHERE Username= '" + Session["username"].ToString() + "'", con);

Label5.Text = cmd.ExecuteScalar().ToString();

con.Close();

}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

{

Label3.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList1.SelectedValue + "'", con);

Label3.Text = cmd.ExecuteScalar().ToString();

con.Close();

}

protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)

{

Label6.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList3.SelectedValue + "'", con);

Label6.Text = cmd.ExecuteScalar().ToString();

con.Close();

//Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)

{

Label7.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList4.SelectedValue + "'", con);

Label7.Text = cmd.ExecuteScalar().ToString();

con.Close();

//Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

protected void DropDownList5_SelectedIndexChanged(object sender, EventArgs e)

{

Label8.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList5.SelectedValue + "'", con);

Label8.Text = cmd.ExecuteScalar().ToString();

con.Close();

//Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

protected void DropDownList6_SelectedIndexChanged(object sender, EventArgs e)

{

Label9.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList6.SelectedValue + "'", con);

Label9.Text = cmd.ExecuteScalar().ToString();

con.Close();

//Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

protected void DropDownList7_SelectedIndexChanged(object sender, EventArgs e)

{

Label10.Visible = true;

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList7.SelectedValue + "'", con);

Label10.Text = cmd.ExecuteScalar().ToString();

con.Close();

//Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

protected void DropDownList8_SelectedIndexChanged(object sender, EventArgs e)

{

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList8.SelectedValue + "'", con);

Label11.Text = cmd.ExecuteScalar().ToString();

con.Close();

// Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

protected void DropDownList9_SelectedIndexChanged(object sender, EventArgs e)

{

con.Open();

SqlCommand cmd = new SqlCommand("SELECT CreditHours FROM Subjects WHERE SubjectName= '" + DropDownList9.SelectedValue + "'", con);

Label12.Text = cmd.ExecuteScalar().ToString();

con.Close();

//Label2.Text = Label6.Text + Label7.Text + Label8.Text + Label9.Text + Label10.Text + Label11.Text + Label12.Text;

}

public void add()

{

int val1 = int.Parse(Label6.Text);

int val2 = int.Parse(Label7.Text);

int val3 = int.Parse(Label8.Text);

int val4 = int.Parse(Label9.Text);

int val5 = int.Parse(Label10.Text);

int val6 = int.Parse(Label11.Text);

int val7 = int.Parse(Label12.Text);

//Label2.Text = (val1 + val2 + val3 + val4 + val5 + val6 + val7).ToString();

}

}

}

 

 

I need to add each label value as int and display in label2 as a string.

Example:

 

If Label 6 = 3 and label 7 =2, the label 2 text should show 5. Each time the dropdownlist value is changed the label 2 should update based on the labels  6,7,8,9,10,11,12. If the dropdwon list is empty the label should not take the value for that specific dropdownlist. Example: if label 6 is empty, label 2 should display only the sum of labels 7,8,9,10,11,12 .

 

 

Thank You