String foreach problem

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Hi guys, i hace a question

i have a datagrid

col1 col2
-----------------
D text0
text1
text2
D text3
D text4

i need to do a foreach and everywhere where's a "D" in col1 to add the
value of col2 into a string, so the final string would be "text0" +
"," + "text3" + "," + "text4";

for example:

string Uvjet()
{
foreach (DataRow red in dt.Rows)
{
if (red["col1"].ToString() == "D")
{
string uvjet = red["col2"].ToString() + ",";
}
}
return uvjet;
}


...only this fills the string "uvjet" only with one value....and i want
it to be finally filled with all necessary values, like:
"text0" + "," + "text3" + "," + "text4"

if you have any ideas, please help...
THANX!

.

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