If you split first, you can use the first column as an Id column and search for exact match:
string line;
using (StreamReader file = new StreamReader(@"db.txt"))
{
while ((line = file.ReadLine()) != null)
{
var values = line.Split(",");
if (values[0] == "1713")
{
label1.Text = values[2];
}
}
}
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solved C# Split with contains