How to minimize if's to a for in c# - if-statement

Question

I have a set of codes in my function with a lot of if-else loops but each doing a diffrent one
like
if(ddlname.SelectedIndex = 0)
{
//do this
}
else
{
//do this
}
if (txtprice.Text ="")
{
//do tis
}
else
{
//do this
}
my whole program looks clumsy and unnecessarily long because of this one. I have some 20 dropdownlists and ten textboxes. Is there way to make this as simple as 1 or 2 for loops ?

Answer 1

I am currently reading Clean Code by Robert C. Martin. According to his book, you should refactor your method into several smaller methods, doing exactly one thing. You should for example extract every do this into its own method.
As to your question, I don't think there is any way of achieving the same logic using for loops, unless you do the same for every call.
foreach (ctl in page.ctls)
{
TextBox tempTextBox = ctl as TextBox;
if (tempTextBox != null)
{
doTheSameForEveryTextBox(tempTextBox)
}
DropDownList tempDropDownList as DropDownList; // not sure if this is the right Type...
if (tempDropDownList != null)
{
doTheSameForEveryTextBox(tempDropDownList)
}
}
void doTheSameForEveryTextBox(TextBox tempTextBox)
{
if (tempTextBox.Text == "")
{
//TODO: implement your code here
}
}
void doTheSameForEveryDropDownList(DropDownList tempDropDownList)
{
if (tempDropDownList.SelectedIndex == 0)
{
//TODO: implement your code here
}
}