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// Replace with your connection string
string connectionString = "Server=myServer;Database=myDB;User ID=myUsername;Password=myPassword;";

// Create a connection to the database
using (SqlConnection connection = new SqlConnection(connectionString))
{
    // Open the connection
    connection.Open();

string query = "INSERT INTO myTable (column1, column2, column3) VALUES (@value1, @value2, @value3)";

    // Create a command to insert a new record
    using (SqlCommand command = new SqlCommand(query, connection))
    {
        // Set the command's parameter values
        command.Parameters.AddWithValue("@value1", "Value 1");
        command.Parameters.AddWithValue("@value2", "Value 2");
        command.Parameters.AddWithValue("@value3", "Value 3");

        // Execute the command
        command.ExecuteNonQuery();
    }
}

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Contoh cara insert data ke table