how to check if string from textbox exists in db

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how to check if string from textbox exists in db -

// Check for duplicates
bool isDuplicate = ExistingList.Any(r =&gt; r.Name == textBox.Name);

 if (isDuplicate)
            {
                MessageBox.Show("Name already Exists");
                return;
            }

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how to check if string from textbox exists in db

how to check if string from textbox exists in db -

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