combobox - c# loop comparisons -

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I do a lot using Cambodox. For example, I often loop through them to find matching based on the selected value ... 

  while (cmbCompany.SelectedValue.ToString ()! = B1ID) { CmbCompany.SelectedIndex ++; }

a) Do I have some very fast options! B) If my comparison was against an integer, then there is a benefit in declaring the string and that is equal to integer. Ostring (), or if i just use B1ID.ToString () in my example (in my example above) Is compiler customizable for me?
C) or string comparison is so slow that I will be better parsing (or casting) the value selected for an integer?

cmbCompany.SelectedValue = B1ID should do the trick - is not it? is?


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