select field equals to all in mssql

i try to figure out if a dropdownlist ddlcountry textfield = ALL, and the value is "A". if it is A, it will select all country as the search field in country in sql statement.

string strcategoryname = txtcatename.text
select * from (multiple tables) where categoryname = " + txtcatename.text + " AND country = " +  ?
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string strcategoryname = txtcatename.text
string strCountryName = ddlCountry.Text
if strCountryName <> "A" then
select * from (multiple tables) where categoryname = " + txtcatename.text + " AND country = " +  strCountryName
select * from (multiple tables) where categoryname = " + txtcatename.text
end if
Second query does not need to filter on country as you want all of them..right?

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Microsoft SQL Server

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